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Retirement Obligation, Current","description":"Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.","units":{"USD":[{"end":"2010-12-31","val":6587000,"accn":"0001047469-12-001130","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-17","frame":"CY2010Q4I"},{"end":"2011-12-31","val":6926000,"accn":"0001047469-12-001130","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-17"},{"end":"2011-12-31","val":6926000,"accn":"0001047469-13-001007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-14","frame":"CY2011Q4I"},{"end":"2012-12-31","val":1643000,"accn":"0001047469-13-001007","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-14"},{"end":"2012-12-31","val":1643000,"accn":"0001104659-14-013223","fy":2013,"fp":"FY","form":"8-K","filed":"2014-02-25","frame":"CY2012Q4I"},{"end":"2013-03-31","val":3693000,"accn":"0001104659-13-035375","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-01"},{"end":"2013-03-31","val":3693000,"accn":"0001104659-14-032052","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-30","frame":"CY2013Q1I"},{"end":"2013-06-30","val":6700000,"accn":"0001104659-13-057972","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-31"},{"end":"2013-06-30","val":6700000,"accn":"0001104659-14-054557","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-30","frame":"CY2013Q2I"},{"end":"2013-09-30","val":9715000,"accn":"0001104659-13-078834","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-30"},{"end":"2013-09-30","val":9715000,"accn":"0001104659-14-074918","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-30","frame":"CY2013Q3I"},{"end":"2013-12-31","val":1248000,"accn":"0001104659-14-013223","fy":2013,"fp":"FY","form":"8-K","filed":"2014-02-25"},{"end":"2013-12-31","val":1248000,"accn":"0001104659-15-011392","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-18","frame":"CY2013Q4I"},{"end":"2014-03-31","val":1118000,"accn":"0001104659-14-032052","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-30"},{"end":"2014-03-31","val":1118000,"accn":"0001104659-15-032743","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-01","frame":"CY2014Q1I"},{"end":"2014-06-30","val":1118000,"accn":"0001104659-14-054557","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-30"},{"end":"2014-06-30","val":1118000,"accn":"0001104659-15-054449","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-30","frame":"CY2014Q2I"},{"end":"2014-09-30","val":1118000,"accn":"0001104659-14-074918","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-30"},{"end":"2014-09-30","val":1118000,"accn":"0001104659-15-073176","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-28","frame":"CY2014Q3I"},{"end":"2014-12-31","val":1071000,"accn":"0001104659-15-011392","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-18"},{"end":"2014-12-31","val":1071000,"accn":"0001104659-16-097811","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-18","frame":"CY2014Q4I"},{"end":"2015-03-31","val":1071000,"accn":"0001104659-15-032743","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-01"},{"end":"2015-03-31","val":1071000,"accn":"0001104659-16-115425","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-04-29","frame":"CY2015Q1I"},{"end":"2015-06-30","val":1071000,"accn":"0001104659-15-054449","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-07-30"},{"end":"2015-06-30","val":1071000,"accn":"0001104659-16-135066","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-07-29"},{"end":"2015-06-30","val":1071000,"accn":"0001104659-16-152646","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-10-28","frame":"CY2015Q2I"},{"end":"2015-09-30","val":1071000,"accn":"0001104659-15-073176","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-10-28"},{"end":"2015-09-30","val":1071000,"accn":"0001104659-16-152646","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-10-28","frame":"CY2015Q3I"},{"end":"2015-12-31","val":1400000,"accn":"0001104659-16-097811","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-18"},{"end":"2015-12-31","val":1400000,"accn":"0001104659-17-009687","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16","frame":"CY2015Q4I"},{"end":"2016-03-31","val":1400000,"accn":"0001104659-16-115425","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-04-29"},{"end":"2016-03-31","val":1400000,"accn":"0001104659-17-027043","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-04-28","frame":"CY2016Q1I"},{"end":"2016-06-30","val":1400000,"accn":"0001104659-16-135066","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-07-29"},{"end":"2016-06-30","val":1400000,"accn":"0001104659-17-047466","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-28","frame":"CY2016Q2I"},{"end":"2016-09-30","val":1400000,"accn":"0001104659-16-152646","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-10-28"},{"end":"2016-09-30","val":1400000,"accn":"0001104659-17-064072","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-10-27","frame":"CY2016Q3I"},{"end":"2016-12-31","val":1118000,"accn":"0001104659-17-009687","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"end":"2016-12-31","val":1118000,"accn":"0001104659-18-010090","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-03-31","val":1118000,"a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tirementObligationRevisionOfEstimate":{"label":"Asset 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015,"fp":"Q3","form":"10-Q","filed":"2015-10-28"},{"start":"2015-01-01","end":"2015-09-30","val":-45226000,"accn":"0001104659-16-152646","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-10-28"},{"start":"2015-01-01","end":"2015-12-31","val":-79432000,"accn":"0001104659-16-097811","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-18"},{"start":"2015-01-01","end":"2015-12-31","val":-79432000,"accn":"0001104659-17-009687","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2015-01-01","end":"2015-12-31","val":-79432000,"accn":"0001104659-18-010090","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":-9921000,"accn":"0001104659-16-115425","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-04-29"},{"start":"2016-01-01","end":"2016-03-31","val":-9921000,"accn":"0001104659-17-027043","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-04-28","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":-25186000,"accn":"0001104659-16-135066","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-07-29"},{"start":"2016-01-01","end":"2016-06-30","val":-25186000,"accn":"0001104659-17-047466","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-28"},{"start":"2016-01-01","end":"2016-09-30","val":988000,"accn":"0001104659-16-152646","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-10-28"},{"start":"2016-01-01","end":"2016-09-30","val":988000,"accn":"0001104659-17-064072","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-10-27"},{"start":"2016-01-01","end":"2016-12-31","val":-5605000,"accn":"0001104659-17-009687","fy":2016,"fp":"FY","form":"10-K","filed":"2017-02-16"},{"start":"2016-01-01","end":"2016-12-31","val":-5605000,"accn":"0001104659-18-010090","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":16807000,"accn":"0001104659-17-027043","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-04-28","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-3172000,"accn":"0001104659-17-047466","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-28"},{"start":"2017-01-01","end":"2017-09-30","val":37234000,"accn":"0001104659-17-064072","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-10-27"},{"start":"2017-01-01","end":"2017-12-31","val":24240000,"accn":"0001104659-18-010090","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents","description":"Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.","units":{"USD":[{"end":"2015-12-31","val":97813000,"accn":"0001104659-19-014968","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":84433000,"accn":"0001104659-18-027251","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-27"},{"end":"2016-12-31","val":84433000,"accn":"0001104659-18-047470","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-27"},{"end":"2016-12-31","val":84433000,"accn":"0001104659-18-063983","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-26"},{"end":"2016-12-31","val":84433000,"accn":"0001104659-19-014968","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2016Q4I"},{"end":"2017-03-31","val":101240000,"accn":"0001104659-18-027251","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-27","frame":"CY2017Q1I"},{"end":"2017-06-30","val":81261000,"accn":"0001104659-18-047470","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-27","frame":"CY2017Q2I"},{"end":"2017-09-30","val":121667000,"accn":"0001104659-18-063983","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-26","frame":"CY2017Q3I"},{"end":"2017-12-31","val":108673000,"accn":"0001104659-18-027251","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-27"},{"end":"2017-12-31","val":108673000,"accn":"0001104659-18-047470","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-27"},{"end":"2017-12-31","val":108673000,"accn":"0001104659-18-063983","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-26"},{"end":"2017-12-31","val":108673000,"accn":"0001104659-19-014968","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15"},{"end":"2017-12-31","val":108673000,"accn":"0001104659-19-028662","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10"},{"end":"2017-12-31","val":108673000,"accn":"0001104659-19-050758","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-09-20"},{"end":"2017-12-31","val":108673000,"accn":"0001104659-19-054793","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-18","frame":"CY2017Q4I"},{"end":"2018-03-31","val":128521000,"accn":"0001104659-18-027251","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-27"},{"end":"2018-03-31","val":128521000,"accn":"0001104659-19-028662","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":96506000,"accn":"0001104659-18-047470","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-27"},{"end":"2018-06-30","val":96506000,"accn":"0001104659-19-050758","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-09-20","frame":"CY2018Q2I"},{"end":"2018-09-30","val":113991000,"accn":"0001104659-18-063983","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-26"},{"end":"2018-09-30","val":113991000,"accn":"0001104659-19-054793","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-18","frame":"CY2018Q3I"},{"end":"2018-12-31","val":92128000,"accn":"0001104659-19-014968","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15"},{"end":"2018-12-31","val":92128000,"accn":"0001104659-19-028662","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10"},{"end":"2018-12-31","val":92128000,"accn":"0001104659-19-050758","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-09-20"},{"end":"2018-12-31","val":92128000,"accn":"0001104659-19-054793","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-18","frame":"CY2018Q4I"},{"end":"2019-03-31","val":62765000,"accn":"0001104659-19-028662","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2019Q1I"},{"end":"2019-06-30","val":88508000,"accn":"0001104659-19-050758","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-09-20","frame":"CY2019Q2I"},{"end":"2019-09-30","val":143613000,"accn":"0001104659-19-054793","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-18","frame":"CY2019Q3I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect","description":"Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.","units":{"USD":[{"start":"2016-01-01","end":"2016-12-31","val":-13380000,"accn":"0001104659-19-014968","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":16807000,"accn":"0001104659-18-027251","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-27","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-3172000,"accn":"0001104659-18-047470","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-27"},{"start":"2017-01-01","end":"2017-09-30","val":37234000,"accn":"0001104659-18-063983","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-26"},{"start":"2017-01-01","end":"2017-12-31","val":24240000,"accn":"0001104659-19-014968","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":19848000,"accn":"0001104659-18-027251","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-04-27"},{"start":"2018-01-01","end":"2018-03-31","val":19848000,"accn":"0001104659-19-028662","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":-12167000,"accn":"0001104659-18-047470","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-07-27"},{"start":"2018-01-01","end":"2018-06-30","val":-12167000,"accn":"0001104659-19-050758","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-09-20"},{"start":"2018-01-01","end":"2018-09-30","val":5318000,"accn":"0001104659-18-063983","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-10-26"},{"start":"2018-01-01","end":"2018-09-30","val":5318000,"accn":"0001104659-19-054793","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-18"},{"start":"2018-01-01","end":"2018-12-31","val":-16545000,"accn":"0001104659-19-014968","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2018"},{"start":"2019-01-01","end":"2019-03-31","val":-29363000,"accn":"0001104659-19-028662","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2019Q1"},{"start":"2019-01-01","end":"2019-06-30","val":-3620000,"accn":"0001104659-19-050758","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-09-20"},{"start":"2019-01-01","end":"2019-09-30","val":51485000,"accn":"0001104659-19-054793","fy":2019,"fp":"Q3","form":"10-Q","filed":"2019-10-18"}]}},"CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations":{"label":"Cash Provided by (Used in) Investing Activities, Discontinued Operations","description":"Amount of cash inflow (outflow) of investing activities of discontinued operations. 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Benefit Plan, Benefit Obligation, Benefits Paid","description":"Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. 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":198000,"accn":"0001104659-19-014968","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":277000,"accn":"0001104659-19-014968","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2017"},{"start":"2018-01-01","end":"2018-12-31","val":392000,"accn":"0001104659-19-014968","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-15","frame":"CY2018"}]}},"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":"2015-01-01","end":"2015-12-31","val":9000,"accn":"0001104659-18-010090","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"},{"start":"2016-01-01","end":"2016-12-31","val":198000,"accn":"0001104659-18-010090","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016"},{"start":"2017-01-01","end":"2017-12-31","val":277000,"accn":"0001104659-18-010090","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter":{"label":"Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years","description":"Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.","units":{"USD":[{"end":"2017-12-31","val":7832000,"accn":"0001104659-18-010090","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths":{"label":"Defined Benefit Plan, Expected Future Benefit Payment, Year One","description":"Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.","units":{"USD":[{"end":"2017-12-31","val":949000,"accn":"0001104659-18-010090","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive":{"label":"Defined Benefit Plan, Expected Future Benefit Payment, Year Five","description":"Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.","units":{"USD":[{"end":"2017-12-31","val":1324000,"accn":"0001104659-18-010090","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour":{"label":"Defined Benefit Plan, Expected Future Benefit Payment, Year Four","description":"Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.","units":{"USD":[{"end":"2017-12-31","val":1204000,"accn":"0001104659-18-010090","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree":{"label":"Defined 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 year.","units":{"USD":[{"end":"2017-12-31","val":1062000,"accn":"0001104659-18-010090","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo":{"label":"Defined 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 year.","units":{"USD":[{"end":"2017-12-31","val":896000,"accn":"0001104659-18-010090","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2017Q4I"}]}},"DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear":{"label":"Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year (Deprecated 2017-01-31)","description":"The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.","units":{"pure":[{"start":"2015-01-01","end":"2015-12-31","val":0.075,"accn":"0001104659-18-010090","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015"}]}},"DefinedBenefitPlanInterestCost":{"label":"Defined Benefit Plan, Interest Cost","description":"Amount of cost recognized for passage of time related to defined benefit 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