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Defined Benefit Pension Plans Expected Future Annual Benefit Payments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]  
2015 $ 4,603us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
2016 3,285us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
2017 3,754us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
2018 3,960us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
2019 4,122us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
2020 - 2024 $ 27,180us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter