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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":1100000,"accn":"0001193125-12-140727","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-03-30","frame":"CY2011Q4I"},{"end":"2012-12-31","val":1100000,"accn":"0001489136-13-000006","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-01","frame":"CY2012Q4I"}]}},"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 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4.","units":{"USD":[{"end":"2011-12-31","val":1914000,"accn":"0001193125-12-140727","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-03-30","frame":"CY2011Q4I"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearOne":{"label":"Defined Benefit Plan, Expected Future Benefit Payments in Year One (Deprecated 2012-01-31)","description":"The amount of the benefits expected to be paid in Year 1.","units":{"USD":[{"end":"2011-12-31","val":1831000,"accn":"0001193125-12-140727","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-03-30","frame":"CY2011Q4I"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearThree":{"label":"Defined Benefit Plan, Expected Future Benefit Payments in Year Three (Deprecated 2012-01-31)","description":"The amount of the benefits expected to be paid in Year 3.","units":{"USD":[{"end":"2011-12-31","val":1716000,"accn":"0001193125-12-140727","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-03-30","frame":"CY2011Q4I"}]}},"DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearTwo":{"label":"Defined Benefit Plan, Expected Future Benefit Payments in Year Two (Deprecated 2012-01-31)","description":"The amount of the benefits expected to be paid in Year 2.","units":{"USD":[{"end":"2011-12-31","val":1727000,"accn":"0001193125-12-140727","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-03-30","frame":"CY2011Q4I"}]}},"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 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