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Consolidated Statements Of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net income $ 63,947us-gaap_NetIncomeLoss $ 57,523us-gaap_NetIncomeLoss
Pension plans and other postretirement benefits:    
Amortization of prior service cost (credit) included in net periodic benefit cost, net of income tax expense (benefit) of $4 in 2015 and $4 in 2014 (3)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax (3)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
Amortization of actuarial net loss (gain) included in net periodic benefit cost, net of income tax expense (benefit) of $768 in 2015 and $384 in 2014 1,360us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax 707us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Amortization of transition obligation (asset) included in net periodic benefit cost, net of income tax expense (benefit) of $1 in 2014 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax 2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax
Total pension plans and other postretirement benefits 1,357us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 706us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Foreign currency translation adjustments, net of income tax expense (benefit) of ($1,098) in 2015 and $985 in 2014 (25,664)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax 1,025us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Other comprehensive income (loss) (24,307)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 1,731us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income $ 39,640us-gaap_ComprehensiveIncomeNetOfTax $ 59,254us-gaap_ComprehensiveIncomeNetOfTax