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For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.","units":{"USD":[{"start":"2016-01-01","end":"2016-12-31","val":6000,"accn":"0001047469-18-001694","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-15","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":481000,"accn":"0001047469-18-001694","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-15"},{"start":"2017-01-01","end":"2017-12-31","val":481000,"accn":"0001047469-19-001116","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-12","frame":"CY2017"},{"start":"2019-01-01","end":"2019-12-31","val":194000,"accn":"0001047469-20-001329","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-09"},{"start":"2019-01-01","end":"2019-12-31","val":194000,"accn":"0001104659-21-036355","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-15","frame":"CY2019"},{"start":"2020-01-01","end":"2020-12-31","val":162000,"accn":"0001104659-21-036355","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-15"},{"start":"2020-01-01","end":"2020-12-31","val":162000,"accn":"0001104659-22-034535","fy":2021,"fp":"FY","form":"10-K","filed":"2022-03-16","frame":"CY2020"},{"start":"2021-01-01","end":"2021-12-31","val":41000,"accn":"0001104659-22-034535","fy":2021,"fp":"FY","form":"10-K","filed":"2022-03-16","frame":"CY2021"}]}},"DefinedBenefitPlanBenefitsPaid":{"label":"Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31)","description":"The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.","units":{"USD":[{"start":"2012-01-01","end":"2012-12-31","val":128000,"accn":"0001047469-14-003172","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-28","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":23000,"accn":"0001047469-14-003172","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-28"},{"start":"2013-01-01","end":"2013-12-31","val":23000,"accn":"0001047469-15-002977","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31","frame":"CY2013"},{"start":"2014-01-01","end":"2014-12-31","val":76000,"accn":"0001047469-15-002977","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-31"},{"start":"2014-01-01","end":"2014-12-31","val":76000,"accn":"0001047469-16-011122","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-14","frame":"CY2014"},{"start":"2015-01-01","end":"2015-12-31","val":84000,"accn":"0001047469-16-011122","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-14"},{"start":"2015-01-01","end":"2015-12-31","val":84000,"accn":"0001047469-17-001630","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-15","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":6000,"accn":"0001047469-17-001630","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-15","frame":"CY2016"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths":{"label":"Defined 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Benefit Plan, Expected Future Benefit Payment, Year Three","description":"Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal 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Benefit Plan, Expected Future Benefit Payment, Year Two","description":"Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal 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Benefit Plan, Funded (Unfunded) Status of Plan","description":"Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) 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