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      },
      "BusinessAcquisitionCostOfAcquiredEntityPurchasePrice": {
        "label": "Business Acquisition, Cost of Acquired Entity, Purchase Price (Deprecated 2013-01-31)",
        "description": "The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.",
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      "BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet": {
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              "accn": "0000059527-18-000032",
              "fy": 2018,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2018-10-26",
              "frame": "CY2018Q3"
            },
            {
              "start": "2018-01-01",
              "end": "2018-12-31",
              "val": 0,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27"
            },
            {
              "start": "2018-01-01",
              "end": "2018-12-31",
              "val": 0,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2018"
            },
            {
              "start": "2019-01-01",
              "end": "2019-12-31",
              "val": 0,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2019"
            }
          ]
        }
      },
      "BusinessCombinationConsiderationTransferred1": {
        "label": "Business Combination, Consideration Transferred",
        "description": "Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.",
        "units": {
          "USD": [
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 65321000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2011"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 143456000,
              "accn": "0000059527-13-000018",
              "fy": 2013,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2013-07-31"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 143456000,
              "accn": "0000059527-13-000024",
              "fy": 2013,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2013-11-01"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 144423000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2012"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 54023000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 54261000,
              "accn": "0000059527-14-000012",
              "fy": 2014,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2014-04-25"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 54261000,
              "accn": "0000059527-14-000022",
              "fy": 2014,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2014-07-28",
              "frame": "CY2013"
            }
          ]
        }
      },
      "BusinessCombinationContingentConsiderationLiability": {
        "label": "Business Combination, Contingent Consideration, Liability",
        "description": "Amount of liability recognized arising from contingent consideration in a business combination.",
        "units": {
          "USD": [
            {
              "end": "2015-09-30",
              "val": 9206000,
              "accn": "0000059527-15-000029",
              "fy": 2015,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2015-10-30",
              "frame": "CY2015Q3I"
            },
            {
              "end": "2015-12-31",
              "val": 9184000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-03-31",
              "val": 1761000,
              "accn": "0000059527-16-000043",
              "fy": 2016,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2016-04-22",
              "frame": "CY2016Q1I"
            },
            {
              "end": "2016-06-30",
              "val": 9251000,
              "accn": "0000059527-16-000053",
              "fy": 2016,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2016-07-26",
              "frame": "CY2016Q2I"
            },
            {
              "end": "2016-09-30",
              "val": 9377000,
              "accn": "0000059527-16-000058",
              "fy": 2016,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2016-10-24",
              "frame": "CY2016Q3I"
            },
            {
              "end": "2016-12-31",
              "val": 8154000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-03-31",
              "val": 8700000,
              "accn": "0000059527-17-000019",
              "fy": 2017,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2017-04-21",
              "frame": "CY2017Q1I"
            },
            {
              "end": "2017-06-30",
              "val": 9186000,
              "accn": "0000059527-17-000030",
              "fy": 2017,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2017-07-26",
              "frame": "CY2017Q2I"
            },
            {
              "end": "2017-09-30",
              "val": 7067000,
              "accn": "0000059527-17-000037",
              "fy": 2017,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2017-10-30",
              "frame": "CY2017Q3I"
            },
            {
              "end": "2017-12-31",
              "val": 7086000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 2100000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet": {
        "label": "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net",
        "description": "Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.",
        "units": {
          "USD": [
            {
              "end": "2011-12-31",
              "val": 46837000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 71683000,
              "accn": "0000059527-13-000008",
              "fy": 2013,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2013-04-26"
            },
            {
              "end": "2012-12-31",
              "val": 71727000,
              "accn": "0000059527-13-000018",
              "fy": 2013,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2013-07-31"
            },
            {
              "end": "2012-12-31",
              "val": 71727000,
              "accn": "0000059527-13-000024",
              "fy": 2013,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2013-11-01"
            },
            {
              "end": "2012-12-31",
              "val": 73257000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-11-30",
              "val": 30531000,
              "accn": "0000059527-14-000012",
              "fy": 2014,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2014-04-25"
            },
            {
              "end": "2013-11-30",
              "val": 30310000,
              "accn": "0000059527-14-000022",
              "fy": 2014,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2014-07-28"
            },
            {
              "end": "2013-12-31",
              "val": 30051000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2013Q4I"
            }
          ]
        }
      },
      "BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss": {
        "label": "Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net",
        "description": "In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.",
        "units": {
          "USD": [
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": 0,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2017"
            },
            {
              "start": "2018-01-01",
              "end": "2018-09-30",
              "val": 0,
              "accn": "0000059527-19-000038",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-10-30"
            },
            {
              "start": "2018-01-01",
              "end": "2018-12-31",
              "val": 0,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27"
            },
            {
              "start": "2018-01-01",
              "end": "2018-12-31",
              "val": 0,
              "accn": "0000059527-21-000008",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-19",
              "frame": "CY2018"
            },
            {
              "start": "2019-01-01",
              "end": "2019-09-30",
              "val": 7601000,
              "accn": "0000059527-19-000038",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-10-30"
            },
            {
              "start": "2019-01-01",
              "end": "2019-09-30",
              "val": 7601000,
              "accn": "0000059527-20-000037",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2020-10-27"
            },
            {
              "start": "2019-07-01",
              "end": "2019-09-30",
              "val": 7601000,
              "accn": "0000059527-19-000038",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-10-30",
              "frame": "CY2019Q3"
            },
            {
              "start": "2019-01-01",
              "end": "2019-12-31",
              "val": 7601000,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27"
            },
            {
              "start": "2019-01-01",
              "end": "2019-12-31",
              "val": 7601000,
              "accn": "0000059527-21-000008",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-19"
            },
            {
              "start": "2019-01-01",
              "end": "2019-12-31",
              "val": 7601000,
              "accn": "0000059527-22-000006",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-02-18",
              "frame": "CY2019"
            },
            {
              "start": "2020-01-01",
              "end": "2020-09-30",
              "val": 0,
              "accn": "0000059527-20-000037",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2020-10-27"
            },
            {
              "start": "2020-01-01",
              "end": "2020-12-31",
              "val": 0,
              "accn": "0000059527-21-000008",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-19"
            },
            {
              "start": "2020-01-01",
              "end": "2020-12-31",
              "val": 0,
              "accn": "0000059527-22-000006",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-02-18",
              "frame": "CY2020"
            },
            {
              "start": "2021-01-01",
              "end": "2021-12-31",
              "val": 0,
              "accn": "0000059527-22-000006",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-02-18",
              "frame": "CY2021"
            }
          ]
        }
      },
      "BusinessExitCosts1": {
        "label": "Business Exit Costs",
        "description": "Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.",
        "units": {
          "USD": [
            {
              "start": "2016-01-01",
              "end": "2016-03-31",
              "val": 0,
              "accn": "0000059527-16-000043",
              "fy": 2016,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2016-04-22",
              "frame": "CY2016Q1"
            },
            {
              "start": "2016-01-01",
              "end": "2016-06-30",
              "val": 0,
              "accn": "0000059527-16-000053",
              "fy": 2016,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2016-07-26"
            },
            {
              "start": "2016-01-01",
              "end": "2016-09-30",
              "val": 0,
              "accn": "0000059527-16-000058",
              "fy": 2016,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2016-10-24"
            },
            {
              "start": "2018-01-01",
              "end": "2018-03-31",
              "val": 9499000,
              "accn": "0000059527-18-000012",
              "fy": 2018,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2018-05-09",
              "frame": "CY2018Q1"
            },
            {
              "start": "2018-01-01",
              "end": "2018-06-30",
              "val": 21091000,
              "accn": "0000059527-18-000026",
              "fy": 2018,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2018-07-27"
            },
            {
              "start": "2018-01-01",
              "end": "2018-09-30",
              "val": 25761000,
              "accn": "0000059527-18-000032",
              "fy": 2018,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2018-10-26"
            },
            {
              "start": "2019-01-01",
              "end": "2019-03-31",
              "val": 2111000,
              "accn": "0000059527-19-000015",
              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-04-26",
              "frame": "CY2019Q1"
            },
            {
              "start": "2019-01-01",
              "end": "2019-06-30",
              "val": 3773000,
              "accn": "0000059527-19-000031",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-07-26"
            },
            {
              "start": "2019-01-01",
              "end": "2019-09-30",
              "val": 5268000,
              "accn": "0000059527-19-000038",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-10-30"
            },
            {
              "start": "2020-01-01",
              "end": "2020-03-31",
              "val": 6757000,
              "accn": "0000059527-20-000015",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2020-04-27",
              "frame": "CY2020Q1"
            },
            {
              "start": "2020-01-01",
              "end": "2020-06-30",
              "val": 7854000,
              "accn": "0000059527-20-000029",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2020-07-27"
            },
            {
              "start": "2020-01-01",
              "end": "2020-09-30",
              "val": 14089000,
              "accn": "0000059527-20-000037",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2020-10-27"
            }
          ]
        }
      },
      "CapitalLeasesBalanceSheetAssetsByMajorClassNet": {
        "label": "Capital Leases, Balance Sheet, Assets by Major Class, Net",
        "description": "The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization.",
        "units": {
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            {
              "end": "2010-12-31",
              "val": 5299000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 3921000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 3921000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24"
            },
            {
              "end": "2012-12-31",
              "val": 487000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22"
            },
            {
              "end": "2012-12-31",
              "val": 487000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 471000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2013Q4I"
            }
          ]
        }
      },
      "CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation": {
        "label": "Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation",
        "description": "The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.",
        "units": {
          "USD": [
            {
              "end": "2010-12-31",
              "val": 2134000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 2494000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 2494000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24"
            },
            {
              "end": "2012-12-31",
              "val": 163000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22"
            },
            {
              "end": "2012-12-31",
              "val": 163000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 100000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2013Q4I"
            }
          ]
        }
      },
      "CashAndCashEquivalentsAtCarryingValue": {
        "label": "Cash and Cash Equivalents, at Carrying Value",
        "description": "Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.",
        "units": {
          "USD": [
            {
              "end": "2007-12-31",
              "val": 217382000,
              "accn": "0001047469-11-001516",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-02-28",
              "frame": "CY2007Q4I"
            },
            {
              "end": "2008-12-31",
              "val": 284332000,
              "accn": "0001193125-10-179221",
              "fy": 2010,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2010-08-05"
            },
            {
              "end": "2008-12-31",
              "val": 284332000,
              "accn": "0001104659-10-056573",
              "fy": 2010,
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              "filed": "2013-02-22"
            },
            {
              "end": "2012-12-31",
              "val": -4101000,
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              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2012Q4I"
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              "end": "2013-12-31",
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              "filed": "2014-02-21"
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            {
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              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
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            {
              "end": "2014-12-31",
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              "filed": "2015-02-20"
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            {
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              "form": "10-K",
              "filed": "2016-02-25",
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            },
            {
              "end": "2015-12-31",
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              "fy": 2015,
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              "filed": "2017-02-24",
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          ]
        }
      },
      "DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetTransitionAssetsObligationsAfterTax": {
        "label": "Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), after Tax",
        "description": "Amount, after tax, of accumulated other comprehensive income (loss) for transition asset (obligation) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.",
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              "filed": "2019-02-27",
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            {
              "end": "2025-12-31",
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              "filed": "2026-02-25",
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      },
      "DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetTransitionAssetsObligationsBeforeTax": {
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        "description": "Amount, before tax, of accumulated other comprehensive income (loss) for transition asset (obligation) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.",
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            },
            {
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              "filed": "2013-02-22",
              "frame": "CY2011Q4I"
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            {
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              "filed": "2014-02-21",
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              "accn": "0000059527-15-000006",
              "fy": 2014,
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              "form": "10-K",
              "filed": "2015-02-20",
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              "filed": "2016-02-25",
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              "filed": "2016-02-25"
            },
            {
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        "label": "Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)",
        "description": "Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.",
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              "form": "10-K",
              "filed": "2012-02-24",
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            {
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              "end": "2011-12-31",
              "val": 29470000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 29470000,
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              "fy": 2012,
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              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2011"
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            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 83156000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 83156000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2012"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 101044000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
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              "form": "10-K",
              "filed": "2014-02-21"
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              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 101044000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2013"
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            {
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              "end": "2014-12-31",
              "val": 108060000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
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              "form": "10-K",
              "filed": "2015-02-20"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 108060000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2014"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 9298000,
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              "fy": 2015,
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              "form": "10-K",
              "filed": "2016-02-25"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 9298000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
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              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2015"
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            {
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              "end": "2016-12-31",
              "val": 38264000,
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              "form": "10-K",
              "filed": "2017-02-24",
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              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2011"
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              "end": "2012-12-31",
              "val": -70015000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
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              "form": "10-K",
              "filed": "2014-02-21",
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              "fy": 2013,
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              "form": "10-K",
              "filed": "2014-02-21"
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              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2013"
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            {
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              "end": "2014-12-31",
              "val": -117881000,
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              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20"
            },
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              "end": "2014-12-31",
              "val": -117881000,
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              "form": "10-K",
              "filed": "2016-02-25",
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              "form": "10-K",
              "filed": "2016-02-25"
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              "fy": 2016,
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              "form": "10-K",
              "filed": "2017-02-24",
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              "form": "10-K",
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        "units": {
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              "form": "10-K",
              "filed": "2012-02-24",
              "frame": "CY2010"
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              "val": -121800000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24",
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          ]
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      },
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        "label": "Defined Benefit Plan, Amortization of Gain (Loss)",
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              "form": "10-K",
              "filed": "2012-02-24",
              "frame": "CY2009"
            },
            {
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              "val": -10396000,
              "accn": "0001104659-11-042664",
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              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-08-02"
            },
            {
              "start": "2010-04-01",
              "end": "2010-06-30",
              "val": -5074000,
              "accn": "0001104659-11-042664",
              "fy": 2011,
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              "form": "10-Q",
              "filed": "2011-08-02",
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            {
              "start": "2010-01-01",
              "end": "2010-09-30",
              "val": -15597000,
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              "form": "10-Q",
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            {
              "start": "2010-07-01",
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              "form": "10-Q",
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            {
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              "accn": "0001047469-12-001433",
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              "form": "10-K",
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              "fy": 2012,
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              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2010"
            },
            {
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              "val": -5472000,
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              "fy": 2012,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2012-04-30",
              "frame": "CY2011Q1"
            },
            {
              "start": "2011-01-01",
              "end": "2011-06-30",
              "val": -10948000,
              "accn": "0001104659-11-042664",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-08-02"
            },
            {
              "start": "2011-01-01",
              "end": "2011-06-30",
              "val": -10948000,
              "accn": "0001104659-12-052583",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-31"
            },
            {
              "start": "2011-04-01",
              "end": "2011-06-30",
              "val": -5476000,
              "accn": "0001104659-11-042664",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-08-02"
            },
            {
              "start": "2011-04-01",
              "end": "2011-06-30",
              "val": -5476000,
              "accn": "0001104659-12-052583",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-31",
              "frame": "CY2011Q2"
            },
            {
              "start": "2011-01-01",
              "end": "2011-09-30",
              "val": -16392000,
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              "val": 0.038,
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              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20"
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            {
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              "end": "2013-12-31",
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              "fy": 2015,
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              "filed": "2016-02-25",
              "frame": "CY2013"
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            {
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              "val": 0.047,
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              "filed": "2017-02-24",
              "frame": "CY2014"
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            {
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              "val": 0.04,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 0.04,
              "accn": "0000059527-17-000006",
              "fy": 2016,
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              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2015"
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              "end": "2016-12-31",
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              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016"
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      },
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            {
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              "filed": "2013-02-22",
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            {
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              "filed": "2013-02-22"
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              "filed": "2014-02-21",
              "frame": "CY2011"
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            {
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              "end": "2012-12-31",
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              "form": "10-K",
              "filed": "2013-02-22"
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            {
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              "filed": "2014-02-21"
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              "form": "10-K",
              "filed": "2015-02-20",
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            {
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              "val": 0.074,
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              "form": "10-K",
              "filed": "2014-02-21"
            },
            {
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              "end": "2013-12-31",
              "val": 0.074,
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              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 0.074,
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              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2013"
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            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 0.073,
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              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 0.073,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25"
            },
            {
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              "end": "2014-12-31",
              "val": 0.073,
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              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
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              "val": 0.063,
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              "fy": 2015,
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              "filed": "2016-02-25"
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            {
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              "filed": "2017-02-24",
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              "form": "10-K",
              "filed": "2012-02-24"
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            {
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              "filed": "2013-02-22"
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            {
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            {
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              "form": "10-K",
              "filed": "2015-02-20",
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            {
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              "val": 0.041,
              "accn": "0000059527-14-000007",
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              "form": "10-K",
              "filed": "2014-02-21"
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            {
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            },
            {
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              "form": "10-K",
              "filed": "2016-02-25",
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            },
            {
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            {
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              "val": 0.041,
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              "form": "10-K",
              "filed": "2016-02-25"
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            {
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              "val": 0.027,
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              "fy": 2015,
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            },
            {
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            {
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      },
      "DefinedBenefitPlanBenefitObligation": {
        "label": "Defined Benefit Plan, Benefit Obligation",
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            {
              "end": "2011-12-31",
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              "filed": "2013-02-22"
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            {
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              "filed": "2014-02-21",
              "frame": "CY2011Q4I"
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            {
              "end": "2012-12-31",
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              "filed": "2013-02-22"
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            {
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              "fy": 2013,
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            {
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              "filed": "2015-02-20",
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              "val": 941442000,
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              "filed": "2014-02-21"
            },
            {
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            {
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            {
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            {
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      },
      "DefinedBenefitPlanBenefitsPaid": {
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        "units": {
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            {
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            {
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            {
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            {
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              "filed": "2016-02-25",
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            {
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              "val": 32217000,
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              "filed": "2016-02-25"
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            {
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              "filed": "2017-02-24",
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            {
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              "end": "2016-12-31",
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      },
      "DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation": {
        "label": "Defined Benefit Plan, Benefit Obligation, Business Combination",
        "description": "Amount of increase in benefit obligation of defined benefit plan from business combination.",
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              "filed": "2016-02-25",
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            {
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              "end": "2015-12-31",
              "val": 6170000,
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              "fy": 2015,
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              "filed": "2016-02-25"
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            {
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              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2015"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 0,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016"
            }
          ]
        }
      },
      "DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets": {
        "label": "Defined Benefit Plan, Plan Assets, Business Combination",
        "description": "Amount of increase in plan assets of defined benefit plan from business combination.",
        "units": {
          "USD": [
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 0,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2014"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 5995000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 5995000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2015"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 0,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016"
            }
          ]
        }
      },
      "DefinedBenefitPlanContributionsByEmployer": {
        "label": "Defined Benefit Plan, Plan Assets, Contributions by Employer",
        "description": "Amount of contribution received by defined benefit plan from employer which increases plan assets.",
        "units": {
          "USD": [
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 44766000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24",
              "frame": "CY2010"
            },
            {
              "start": "2011-01-01",
              "end": "2011-06-30",
              "val": 16000000,
              "accn": "0001104659-11-042664",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-08-02"
            },
            {
              "start": "2011-01-01",
              "end": "2011-09-30",
              "val": 30000000,
              "accn": "0001104659-11-058711",
              "fy": 2011,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2011-10-28"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 33994000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 33994000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2011"
            },
            {
              "start": "2012-01-01",
              "end": "2012-03-31",
              "val": 18000000,
              "accn": "0001104659-12-030323",
              "fy": 2012,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2012-04-30",
              "frame": "CY2012Q1"
            },
            {
              "start": "2012-01-01",
              "end": "2012-06-30",
              "val": 36000000,
              "accn": "0001104659-12-052583",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-31"
            },
            {
              "start": "2012-01-01",
              "end": "2012-09-30",
              "val": 53277000,
              "accn": "0001104659-12-073471",
              "fy": 2012,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2012-11-02"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 68029000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 68029000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2012"
            },
            {
              "start": "2013-01-01",
              "end": "2013-03-31",
              "val": 50000000,
              "accn": "0000059527-13-000008",
              "fy": 2013,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2013-04-26",
              "frame": "CY2013Q1"
            },
            {
              "start": "2013-01-01",
              "end": "2013-06-30",
              "val": 75000000,
              "accn": "0000059527-13-000018",
              "fy": 2013,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2013-07-31"
            },
            {
              "start": "2013-01-01",
              "end": "2013-09-30",
              "val": 75216000,
              "accn": "0000059527-13-000024",
              "fy": 2013,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2013-11-01"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 85456000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 85456000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2013"
            },
            {
              "start": "2014-01-01",
              "end": "2014-03-31",
              "val": 20000000,
              "accn": "0000059527-14-000012",
              "fy": 2014,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2014-04-25",
              "frame": "CY2014Q1"
            },
            {
              "start": "2014-01-01",
              "end": "2014-06-30",
              "val": 20000000,
              "accn": "0000059527-14-000022",
              "fy": 2014,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2014-07-28"
            },
            {
              "start": "2014-01-01",
              "end": "2014-09-30",
              "val": 21175000,
              "accn": "0000059527-14-000028",
              "fy": 2014,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2014-10-30"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 27550000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 27550000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2014"
            },
            {
              "start": "2015-01-01",
              "end": "2015-03-31",
              "val": 20000000,
              "accn": "0000059527-15-000014",
              "fy": 2015,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2015-04-24",
              "frame": "CY2015Q1"
            },
            {
              "start": "2015-01-01",
              "end": "2015-06-30",
              "val": 45000000,
              "accn": "0000059527-15-000023",
              "fy": 2015,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2015-07-27"
            },
            {
              "start": "2015-01-01",
              "end": "2015-09-30",
              "val": 47000000,
              "accn": "0000059527-15-000029",
              "fy": 2015,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2015-10-30"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 50468000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 50468000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2015"
            },
            {
              "start": "2016-01-01",
              "end": "2016-03-31",
              "val": 20000000,
              "accn": "0000059527-16-000043",
              "fy": 2016,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2016-04-22",
              "frame": "CY2016Q1"
            },
            {
              "start": "2016-01-01",
              "end": "2016-06-30",
              "val": 20000000,
              "accn": "0000059527-16-000053",
              "fy": 2016,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2016-07-26"
            },
            {
              "start": "2016-01-01",
              "end": "2016-09-30",
              "val": 20086000,
              "accn": "0000059527-16-000058",
              "fy": 2016,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2016-10-24"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 21373000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016"
            }
          ]
        }
      },
      "DefinedBenefitPlanContributionsByPlanParticipants": {
        "label": "Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31)",
        "description": "The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.",
        "units": {
          "USD": [
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 365000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24",
              "frame": "CY2010"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 365000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 365000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2011"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 334000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 334000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2012"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 221000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 221000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2013"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 215000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 215000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2014"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 185000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 185000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2015"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 148000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016"
            }
          ]
        }
      },
      "DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear": {
        "label": "Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year (Deprecated 2013-01-31)",
        "description": "The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.",
        "units": {
          "USD": [
            {
              "end": "2011-12-31",
              "val": 30000000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 103000000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2012Q4I"
            }
          ]
        }
      },
      "DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear": {
        "label": "Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year",
        "description": "Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.",
        "units": {
          "USD": [
            {
              "end": "2018-12-31",
              "val": -3924000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-12-31",
              "val": -3105000,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2019Q4I"
            }
          ]
        }
      },
      "DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear": {
        "label": "Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year",
        "description": "Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.",
        "units": {
          "USD": [
            {
              "end": "2018-12-31",
              "val": 59000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-12-31",
              "val": 60000,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2019Q4I"
            }
          ]
        }
      },
      "DefinedBenefitPlanExpectedAmortizationOfTransitionAssetObligationNextFiscalYear": {
        "label": "Defined Benefit Plan, Expected Amortization of Transition Asset (Obligation), Next Fiscal Year",
        "description": "Amount included in accumulated other comprehensive income (loss) for transition asset (obligation) expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.",
        "units": {
          "USD": [
            {
              "end": "2018-12-31",
              "val": 3000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-12-31",
              "val": 3000,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2019Q4I"
            }
          ]
        }
      },
      "DefinedBenefitPlanExpectedReturnOnPlanAssets": {
        "label": "Defined Benefit Plan, Expected Return (Loss) on Plan Assets",
        "description": "Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.",
        "units": {
          "USD": [
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": 43802000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24",
              "frame": "CY2009"
            },
            {
              "start": "2010-01-01",
              "end": "2010-06-30",
              "val": 25138000,
              "accn": "0001104659-11-042664",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-08-02"
            },
            {
              "start": "2010-04-01",
              "end": "2010-06-30",
              "val": 12857000,
              "accn": "0001104659-11-042664",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-08-02",
              "frame": "CY2010Q2"
            },
            {
              "start": "2010-01-01",
              "end": "2010-09-30",
              "val": 37758000,
              "accn": "0001104659-11-058711",
              "fy": 2011,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2011-10-28"
            },
            {
              "start": "2010-07-01",
              "end": "2010-09-30",
              "val": 12620000,
              "accn": "0001104659-11-058711",
              "fy": 2011,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2011-10-28",
              "frame": "CY2010Q3"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 50424000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 50424000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2010"
            },
            {
              "start": "2011-01-01",
              "end": "2011-03-31",
              "val": 14355000,
              "accn": "0001104659-12-030323",
              "fy": 2012,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2012-04-30",
              "frame": "CY2011Q1"
            },
            {
              "start": "2011-01-01",
              "end": "2011-06-30",
              "val": 28738000,
              "accn": "0001104659-11-042664",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-08-02"
            },
            {
              "start": "2011-01-01",
              "end": "2011-06-30",
              "val": 28738000,
              "accn": "0001104659-12-052583",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-31"
            },
            {
              "start": "2011-04-01",
              "end": "2011-06-30",
              "val": 14383000,
              "accn": "0001104659-11-042664",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-08-02"
            },
            {
              "start": "2011-04-01",
              "end": "2011-06-30",
              "val": 14383000,
              "accn": "0001104659-12-052583",
              "fy": 2012,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2012-07-31",
              "frame": "CY2011Q2"
            },
            {
              "start": "2011-01-01",
              "end": "2011-09-30",
              "val": 43061000,
              "accn": "0001104659-11-058711",
              "fy": 2011,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2011-10-28"
            },
            {
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              "filed": "2015-02-20",
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            {
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            {
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            {
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            {
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              "form": "10-Q",
              "filed": "2011-10-28"
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            {
              "end": "2010-12-31",
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              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27"
            },
            {
              "end": "2018-12-31",
              "val": 111000,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2018Q4I"
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            {
              "end": "2019-12-31",
              "val": 112000,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2019Q4I"
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          ]
        }
      },
      "LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities": {
        "label": "Long-term Debt and Lease Obligation, Including Current Maturities",
        "description": "Amount of long-term debt and lease obligation, including portion classified as current.",
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              "form": "10-K",
              "filed": "2016-02-25",
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            {
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              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25"
            },
            {
              "end": "2015-12-31",
              "val": 351803000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
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              "fy": 2016,
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              "filed": "2017-02-24"
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            {
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              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27",
              "frame": "CY2016Q4I"
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            {
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              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27"
            },
            {
              "end": "2017-12-31",
              "val": 704247000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 702660000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27"
            },
            {
              "end": "2018-12-31",
              "val": 702660000,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-12-31",
              "val": 712414000,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2019Q4I"
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          ]
        }
      },
      "LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterYearFive": {
        "label": "Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five",
        "description": "Principal amount of long-term debt and capital lease obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "units": {
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              "filed": "2014-02-21",
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              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2014Q4I"
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            {
              "end": "2015-12-31",
              "val": 350315000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2015Q4I"
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            {
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              "val": 710712000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016Q4I"
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            {
              "end": "2017-12-31",
              "val": 710607000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 700000000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-12-31",
              "val": 700000000,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2019Q4I"
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          ]
        }
      },
      "LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFive": {
        "label": "Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five",
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        "units": {
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              "val": 202000,
              "accn": "0000059527-14-000007",
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              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 104000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
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            {
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              "val": 101000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
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            {
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              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016Q4I"
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            {
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              "val": 107000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
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              "form": "10-K",
              "filed": "2018-02-27",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
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              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-12-31",
              "val": 0,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2019Q4I"
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          ]
        }
      },
      "LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour": {
        "label": "Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four",
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        "units": {
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              "accn": "0000059527-14-000007",
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              "filed": "2014-02-21",
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              "accn": "0000059527-15-000006",
              "fy": 2014,
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              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2014Q4I"
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            {
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              "fy": 2015,
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              "form": "10-K",
              "filed": "2016-02-25",
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            {
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              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016Q4I"
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            {
              "end": "2017-12-31",
              "val": 110000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 107000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-12-31",
              "val": 10607000,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2019Q4I"
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          ]
        }
      },
      "LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree": {
        "label": "Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three",
        "description": "Principal amount of long-term debt and capital lease obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "units": {
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              "end": "2013-12-31",
              "val": 446000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
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              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2014Q4I"
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            {
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              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2015Q4I"
            },
            {
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              "val": 103000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 108000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 110000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-12-31",
              "val": 105000,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2019Q4I"
            }
          ]
        }
      },
      "LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo": {
        "label": "Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two",
        "description": "Principal amount of long-term debt and capital lease obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "units": {
          "USD": [
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              "end": "2013-12-31",
              "val": 535000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
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              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2013Q4I"
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            {
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              "val": 1684000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 569000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 104000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 111000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 114000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
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            {
              "end": "2019-12-31",
              "val": 119000,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2019Q4I"
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          ]
        }
      },
      "LongTermDebtAndCapitalLeaseObligationsRepaymentsOfPrincipalInNextTwelveMonths": {
        "label": "Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months",
        "description": "Principal amount of long-term debt and capital lease obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "units": {
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              "accn": "0000059527-14-000007",
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              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2013Q4I"
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            {
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              "val": 68169000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 4284000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 1889000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 2132000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 111000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
            },
            {
              "end": "2019-12-31",
              "val": 34969000,
              "accn": "0000059527-20-000007",
              "fy": 2019,
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              "form": "10-K",
              "filed": "2020-02-27",
              "frame": "CY2019Q4I"
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          ]
        }
      },
      "LongTermDebtCurrent": {
        "label": "Long-term Debt, Current Maturities",
        "description": "Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.",
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              "form": "10-K",
              "filed": "2021-02-19",
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              "accn": "0000059527-21-000008",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-19"
            },
            {
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              "accn": "0000059527-22-000006",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-02-18",
              "frame": "CY2020Q4I"
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            {
              "end": "2021-12-31",
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              "fy": 2021,
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              "form": "10-K",
              "filed": "2022-02-18"
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              "accn": "0000059527-23-000004",
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              "accn": "0000059527-23-000004",
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              "form": "10-K",
              "filed": "2023-02-21"
            },
            {
              "end": "2022-12-31",
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              "accn": "0000059527-24-000008",
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              "form": "10-K",
              "filed": "2024-02-27",
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            {
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              "accn": "0000059527-24-000008",
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              "filed": "2024-02-27"
            },
            {
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              "form": "10-K",
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            {
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              "accn": "0000059527-26-000006",
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              "form": "10-K",
              "filed": "2026-02-25",
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        "label": "Operating Leases, Future Minimum Payments, Due in Five Years",
        "description": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "units": {
          "USD": [
            {
              "end": "2011-12-31",
              "val": 3330000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 4561000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 4071000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 4126000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 3557000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 3816000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 4892000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 3625000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "OperatingLeasesFutureMinimumPaymentsDueInFourYears": {
        "label": "Operating Leases, Future Minimum Payments, Due in Four Years",
        "description": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "units": {
          "USD": [
            {
              "end": "2011-12-31",
              "val": 3839000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 5695000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 5637000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 5425000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 5025000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 5220000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 5252000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 4744000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "OperatingLeasesFutureMinimumPaymentsDueInThreeYears": {
        "label": "Operating Leases, Future Minimum Payments, Due in Three Years",
        "description": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "units": {
          "USD": [
            {
              "end": "2011-12-31",
              "val": 5443000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 6872000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 8240000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 7895000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 6623000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 7670000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 8972000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 7720000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "OperatingLeasesFutureMinimumPaymentsDueInTwoYears": {
        "label": "Operating Leases, Future Minimum Payments, Due in Two Years",
        "description": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "units": {
          "USD": [
            {
              "end": "2011-12-31",
              "val": 7720000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 9385000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 10391000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 10672000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 8735000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 9824000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 13358000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 11915000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "OperatingLeasesFutureMinimumPaymentsDueThereafter": {
        "label": "Operating Leases, Future Minimum Payments, Due Thereafter",
        "description": "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
        "units": {
          "USD": [
            {
              "end": "2011-12-31",
              "val": 5264000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 7082000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 6568000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 3906000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 5584000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 4888000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 5629000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 10033000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "OperatingLeasesRentExpenseNet": {
        "label": "Operating Leases, Rent Expense, Net",
        "description": "Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.",
        "units": {
          "USD": [
            {
              "start": "2009-01-01",
              "end": "2009-12-31",
              "val": 14275000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24",
              "frame": "CY2009"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 14155000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24"
            },
            {
              "start": "2010-01-01",
              "end": "2010-12-31",
              "val": 14155000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22",
              "frame": "CY2010"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 15221000,
              "accn": "0001047469-12-001433",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-24"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 15221000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22"
            },
            {
              "start": "2011-01-01",
              "end": "2011-12-31",
              "val": 15221000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21",
              "frame": "CY2011"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 17751000,
              "accn": "0001445305-13-000291",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-02-22"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 17751000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21"
            },
            {
              "start": "2012-01-01",
              "end": "2012-12-31",
              "val": 17751000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20",
              "frame": "CY2012"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 18642000,
              "accn": "0000059527-14-000007",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-02-21"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 18642000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20"
            },
            {
              "start": "2013-01-01",
              "end": "2013-12-31",
              "val": 18642000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25",
              "frame": "CY2013"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 18103000,
              "accn": "0000059527-15-000006",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-02-20"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 18103000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25"
            },
            {
              "start": "2014-01-01",
              "end": "2014-12-31",
              "val": 18103000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24",
              "frame": "CY2014"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 16703000,
              "accn": "0000059527-16-000036",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-25"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 16703000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24"
            },
            {
              "start": "2015-01-01",
              "end": "2015-12-31",
              "val": 16703000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27",
              "frame": "CY2015"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 16897000,
              "accn": "0000059527-17-000006",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-02-24"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 16897000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27"
            },
            {
              "start": "2016-01-01",
              "end": "2016-12-31",
              "val": 16897000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2016"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": 20450000,
              "accn": "0000059527-18-000006",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-27"
            },
            {
              "start": "2017-01-01",
              "end": "2017-12-31",
              "val": 20450000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2017"
            },
            {
              "start": "2018-01-01",
              "end": "2018-12-31",
              "val": 25720000,
              "accn": "0000059527-19-000008",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-27",
              "frame": "CY2018"
            }
          ]
        }
      },
      "OperatingLeaseWeightedAverageDiscountRatePercent": {
        "label": "Operating Lease, Weighted Average Discount Rate, Percent",
        "description": "Weighted average discount rate for operating lease calculated at point in time.",
        "units": {
          "pure": [
            {
              "end": "2019-03-31",
              "val": 0.036,
              "accn": "0000059527-19-000015",
              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-04-26",
              "frame": "CY2019Q1I"
            },
            {
              "end": "2019-06-30",
              "val": 0.036,
              "accn": "0000059527-19-000031",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-07-26",
              "frame": "CY2019Q2I"
            },
            {
              "end": "2019-09-30",
              "val": 0.036,
              "accn": "0000059527-19-000038",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-10-30",
              "frame": "CY2019Q3I"
            },
            {
              "end": "2019-12-31",
              "val": 0.036,
              "accn": "0000059527-20-000007",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-27"
            },
            {
              "end": "2019-12-31",
              "val": 0.036,
              "accn": "0000059527-21-000008",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-19",
              "frame": "CY2019Q4I"
            },
            {
              "end": "2020-03-31",
              "val": 0.036,
              "accn": "0000059527-20-000015",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2020-04-27",
              "frame": "CY2020Q1I"
            },
            {
              "end": "2020-06-30",
              "val": 0.036,
              "accn": "0000059527-20-000029",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2020-07-27",
              "frame": "CY2020Q2I"
            },
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        "label": "Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (Deprecated 2012-01-31)",
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      "OtherComprehensiveIncomeDerivativesQualifyingAsHedgesTaxEffectPeriodIncreaseDecrease": {
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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            {
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            },
            {
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            {
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        "label": "Debt Issuance Costs, Net",
        "description": "Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.",
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            {
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            {
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            },
            {
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            },
            {
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            },
            {
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          ]
        }
      },
      "EmbeddedDerivativeFairValueOfEmbeddedDerivativeLiability": {
        "label": "Embedded Derivative, Fair Value of Embedded Derivative Liability",
        "description": "Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.",
        "units": {
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      }
    }
  }
}