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            {
              "end": "2023-12-31",
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            {
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              "end": "2024-12-31",
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            {
              "end": "2024-12-31",
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              "end": "2024-12-31",
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              "end": "2025-09-30",
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              "end": "2025-12-31",
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      "AssetsHeldForSaleCurrent": {
        "label": "Assets Held-for-sale, Current (Deprecated 2014-01-31)",
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              "filed": "2012-11-08",
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          ]
        }
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      "AvailableForSaleSecurities": {
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              "val": 51300000,
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              "filed": "2011-03-01",
              "frame": "CY2009Q4I"
            },
            {
              "end": "2010-12-31",
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              "frame": "CY2010Q4I"
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            {
              "end": "2010-12-31",
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              "form": "10-K",
              "filed": "2011-03-01"
            }
          ]
        }
      },
      "AvailableForSaleSecuritiesCurrent": {
        "label": "Available-for-sale Securities, Current",
        "description": "Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.",
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              "filed": "2010-03-01",
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            {
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            {
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            },
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            {
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            {
              "end": "2009-12-31",
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            {
              "end": "2009-12-31",
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            {
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            },
            {
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              "filed": "2010-03-01"
            },
            {
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              "filed": "2010-08-09",
              "frame": "CY2010Q2I"
            },
            {
              "end": "2010-09-30",
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              "filed": "2010-11-09",
              "frame": "CY2010Q3I"
            },
            {
              "end": "2010-12-31",
              "val": 9290000,
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              "filed": "2012-02-29",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2010-12-31",
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              "accn": "0001193125-11-303810",
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            },
            {
              "end": "2010-12-31",
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              "accn": "0001193125-11-216070",
              "fy": 2011,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2011-08-09"
            },
            {
              "end": "2010-12-31",
              "val": 9290000,
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            },
            {
              "end": "2010-12-31",
              "val": 9290000,
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              "fy": 2010,
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              "filed": "2011-03-01"
            },
            {
              "end": "2011-03-31",
              "val": 982000,
              "accn": "0001193125-11-133640",
              "fy": 2011,
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              "form": "10-Q",
              "filed": "2011-05-10",
              "frame": "CY2011Q1I"
            },
            {
              "end": "2011-06-30",
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              "fy": 2011,
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            },
            {
              "end": "2011-09-30",
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              "filed": "2011-11-09",
              "frame": "CY2011Q3I"
            },
            {
              "end": "2011-12-31",
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              "frame": "CY2011Q4I"
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          ]
        }
      },
      "AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost": {
        "label": "Available-for-sale Securities, Debt Maturities, Amortized Cost Basis (Deprecated 2014-01-31)",
        "description": "Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.",
        "units": {
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              "end": "2010-12-31",
              "val": 9211000,
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              "filed": "2011-03-01",
              "frame": "CY2010Q4I"
            }
          ]
        }
      },
      "AvailableForSaleSecuritiesDebtMaturitiesFairValue": {
        "label": "Available-for-sale Securities, Debt Maturities, Fair Value (Deprecated 2011-01-31)",
        "description": "This item represents the total of all debt securities grouped by maturity dates, at fair value, which are categorized neither as held-to-maturity nor trading securities.",
        "units": {
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            {
              "end": "2010-12-31",
              "val": 9290000,
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          ]
        }
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      },
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          ]
        }
      },
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              "form": "10-K",
              "filed": "2012-02-29",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 15366000,
              "accn": "0001043277-13-000004",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-01",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 15619000,
              "accn": "0001043277-14-000004",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-03",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 13559000,
              "accn": "0001628280-15-001350",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-03-02",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 22437000,
              "accn": "0001043277-16-000020",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-29",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 24393000,
              "accn": "0001043277-17-000004",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-01",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 22807000,
              "accn": "0001043277-18-000007",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-28",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 19406000,
              "accn": "0001043277-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-25"
            },
            {
              "end": "2018-12-31",
              "val": 19406000,
              "accn": "0001043277-19-000019",
              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-05-08"
            },
            {
              "end": "2018-12-31",
              "val": 19406000,
              "accn": "0001043277-19-000033",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-08-08"
            },
            {
              "end": "2018-12-31",
              "val": 19406000,
              "accn": "0001043277-19-000047",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-11-04"
            },
            {
              "end": "2018-12-31",
              "val": 19406000,
              "accn": "0001043277-20-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-19",
              "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": "2010-12-31",
              "val": 15726000,
              "accn": "0001193125-11-051458",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-01",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 20222000,
              "accn": "0001193125-12-088389",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-29",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 22523000,
              "accn": "0001043277-13-000004",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-01",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 22935000,
              "accn": "0001043277-14-000004",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-03",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 18794000,
              "accn": "0001628280-15-001350",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-03-02",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 27842000,
              "accn": "0001043277-16-000020",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-29",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 29716000,
              "accn": "0001043277-17-000004",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-01",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 29851000,
              "accn": "0001043277-18-000007",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-28",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 27644000,
              "accn": "0001043277-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-25"
            },
            {
              "end": "2018-12-31",
              "val": 27644000,
              "accn": "0001043277-19-000019",
              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-05-08"
            },
            {
              "end": "2018-12-31",
              "val": 27644000,
              "accn": "0001043277-19-000033",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-08-08"
            },
            {
              "end": "2018-12-31",
              "val": 27644000,
              "accn": "0001043277-19-000047",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-11-04"
            },
            {
              "end": "2018-12-31",
              "val": 27644000,
              "accn": "0001043277-20-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-19",
              "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": "2010-12-31",
              "val": 18844000,
              "accn": "0001193125-11-051458",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-01",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 25400000,
              "accn": "0001193125-12-088389",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-29",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 30576000,
              "accn": "0001043277-13-000004",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-01",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 29466000,
              "accn": "0001043277-14-000004",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-03",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 28295000,
              "accn": "0001628280-15-001350",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-03-02",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 31349000,
              "accn": "0001043277-16-000020",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-29",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 32249000,
              "accn": "0001043277-17-000004",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-01",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 39825000,
              "accn": "0001043277-18-000007",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-28",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 36832000,
              "accn": "0001043277-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-25"
            },
            {
              "end": "2018-12-31",
              "val": 36832000,
              "accn": "0001043277-19-000019",
              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-05-08"
            },
            {
              "end": "2018-12-31",
              "val": 36832000,
              "accn": "0001043277-19-000033",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-08-08"
            },
            {
              "end": "2018-12-31",
              "val": 36832000,
              "accn": "0001043277-19-000047",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-11-04"
            },
            {
              "end": "2018-12-31",
              "val": 36832000,
              "accn": "0001043277-20-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-19",
              "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": "2010-12-31",
              "val": 22512000,
              "accn": "0001193125-11-051458",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-01",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 28755000,
              "accn": "0001193125-12-088389",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-29",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 38301000,
              "accn": "0001043277-13-000004",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-01",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 37510000,
              "accn": "0001043277-14-000004",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-03",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 35419000,
              "accn": "0001628280-15-001350",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-03-02",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 39108000,
              "accn": "0001043277-16-000020",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-29",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 38531000,
              "accn": "0001043277-17-000004",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-01",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 46172000,
              "accn": "0001043277-18-000007",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-28",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 47680000,
              "accn": "0001043277-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-25"
            },
            {
              "end": "2018-12-31",
              "val": 47680000,
              "accn": "0001043277-19-000019",
              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-05-08"
            },
            {
              "end": "2018-12-31",
              "val": 47680000,
              "accn": "0001043277-19-000033",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-08-08"
            },
            {
              "end": "2018-12-31",
              "val": 47680000,
              "accn": "0001043277-19-000047",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-11-04"
            },
            {
              "end": "2018-12-31",
              "val": 47680000,
              "accn": "0001043277-20-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-19",
              "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": "2010-12-31",
              "val": 21224000,
              "accn": "0001193125-11-051458",
              "fy": 2010,
              "fp": "FY",
              "form": "10-K",
              "filed": "2011-03-01",
              "frame": "CY2010Q4I"
            },
            {
              "end": "2011-12-31",
              "val": 20913000,
              "accn": "0001193125-12-088389",
              "fy": 2011,
              "fp": "FY",
              "form": "10-K",
              "filed": "2012-02-29",
              "frame": "CY2011Q4I"
            },
            {
              "end": "2012-12-31",
              "val": 22702000,
              "accn": "0001043277-13-000004",
              "fy": 2012,
              "fp": "FY",
              "form": "10-K",
              "filed": "2013-03-01",
              "frame": "CY2012Q4I"
            },
            {
              "end": "2013-12-31",
              "val": 17540000,
              "accn": "0001043277-14-000004",
              "fy": 2013,
              "fp": "FY",
              "form": "10-K",
              "filed": "2014-03-03",
              "frame": "CY2013Q4I"
            },
            {
              "end": "2014-12-31",
              "val": 9807000,
              "accn": "0001628280-15-001350",
              "fy": 2014,
              "fp": "FY",
              "form": "10-K",
              "filed": "2015-03-02",
              "frame": "CY2014Q4I"
            },
            {
              "end": "2015-12-31",
              "val": 108845000,
              "accn": "0001043277-16-000020",
              "fy": 2015,
              "fp": "FY",
              "form": "10-K",
              "filed": "2016-02-29",
              "frame": "CY2015Q4I"
            },
            {
              "end": "2016-12-31",
              "val": 113786000,
              "accn": "0001043277-17-000004",
              "fy": 2016,
              "fp": "FY",
              "form": "10-K",
              "filed": "2017-03-01",
              "frame": "CY2016Q4I"
            },
            {
              "end": "2017-12-31",
              "val": 92797000,
              "accn": "0001043277-18-000007",
              "fy": 2017,
              "fp": "FY",
              "form": "10-K",
              "filed": "2018-02-28",
              "frame": "CY2017Q4I"
            },
            {
              "end": "2018-12-31",
              "val": 81465000,
              "accn": "0001043277-19-000006",
              "fy": 2018,
              "fp": "FY",
              "form": "10-K",
              "filed": "2019-02-25"
            },
            {
              "end": "2018-12-31",
              "val": 81465000,
              "accn": "0001043277-19-000019",
              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-05-08"
            },
            {
              "end": "2018-12-31",
              "val": 81465000,
              "accn": "0001043277-19-000033",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-08-08"
            },
            {
              "end": "2018-12-31",
              "val": 81465000,
              "accn": "0001043277-19-000047",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-11-04"
            },
            {
              "end": "2018-12-31",
              "val": 81465000,
              "accn": "0001043277-20-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-19",
              "frame": "CY2018Q4I"
            }
          ]
        }
      },
      "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": "0001043277-19-000019",
              "fy": 2019,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2019-05-08",
              "frame": "CY2019Q1I"
            },
            {
              "end": "2019-06-30",
              "val": 0.036,
              "accn": "0001043277-19-000033",
              "fy": 2019,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2019-08-08",
              "frame": "CY2019Q2I"
            },
            {
              "end": "2019-09-30",
              "val": 0.036,
              "accn": "0001043277-19-000047",
              "fy": 2019,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2019-11-04",
              "frame": "CY2019Q3I"
            },
            {
              "end": "2019-12-31",
              "val": 0.034,
              "accn": "0001043277-20-000016",
              "fy": 2019,
              "fp": "FY",
              "form": "10-K",
              "filed": "2020-02-19"
            },
            {
              "end": "2019-12-31",
              "val": 0.034,
              "accn": "0001043277-21-000009",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-19",
              "frame": "CY2019Q4I"
            },
            {
              "end": "2020-03-31",
              "val": 0.033,
              "accn": "0001043277-20-000027",
              "fy": 2020,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2020-05-01",
              "frame": "CY2020Q1I"
            },
            {
              "end": "2020-06-30",
              "val": 0.033,
              "accn": "0001043277-20-000036",
              "fy": 2020,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2020-07-31",
              "frame": "CY2020Q2I"
            },
            {
              "end": "2020-09-30",
              "val": 0.032,
              "accn": "0001043277-20-000042",
              "fy": 2020,
              "fp": "Q3",
              "form": "10-Q",
              "filed": "2020-10-30",
              "frame": "CY2020Q3I"
            },
            {
              "end": "2020-12-31",
              "val": 0.032,
              "accn": "0001043277-21-000009",
              "fy": 2020,
              "fp": "FY",
              "form": "10-K",
              "filed": "2021-02-19"
            },
            {
              "end": "2020-12-31",
              "val": 0.032,
              "accn": "0001043277-22-000006",
              "fy": 2021,
              "fp": "FY",
              "form": "10-K",
              "filed": "2022-02-23",
              "frame": "CY2020Q4I"
            },
            {
              "end": "2021-03-31",
              "val": 0.031,
              "accn": "0001043277-21-000016",
              "fy": 2021,
              "fp": "Q1",
              "form": "10-Q",
              "filed": "2021-04-30",
              "frame": "CY2021Q1I"
            },
            {
              "end": "2021-06-30",
              "val": 0.031,
              "accn": "0001043277-21-000024",
              "fy": 2021,
              "fp": "Q2",
              "form": "10-Q",
              "filed": "2021-07-30",
              "frame": "CY2021Q2I"
            },
            {
              "end": "2021-09-30",
              "val": 0.03,
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