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Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 36,879 us-gaap_NetIncomeLoss | $ 21,947 us-gaap_NetIncomeLoss | $ 28,251 us-gaap_NetIncomeLoss
Foreign currency translation adjustment: |  |  |
Unrealized foreign currency translation adjustment (net of tax benefit of $2,396 in 2014, tax of $233 in 2013 and tax of $897 in 2012) | (28,065)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | (19,336)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | (11,562)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Derivative financial instruments adjustment | (109)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | (228)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax | 1,399 us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Pension & other post-retirement benefit adjustments |  |  |
Net gains (losses) and prior service costs (net of tax benefit of $22,445 in 2014, tax of $13,231 in 2013 and tax benefit of $11,145 in 2012) | (38,730)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax | 22,203 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax | (19,285)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Amortization of prior service costs and net gains or losses (net of tax of $3,582 in 2014, tax of $5,398 in 2013 and tax of $3,749 in 2012) | 6,997 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax | 9,420 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax | 6,486 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax
Other comprehensive income (loss) | (59,907)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 12,059 us-gaap_OtherComprehensiveIncomeLossNetOfTax | (22,962)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income (loss) | $ (23,028)us-gaap_ComprehensiveIncomeNetOfTax | $ 34,006 us-gaap_ComprehensiveIncomeNetOfTax | $ 5,289 us-gaap_ComprehensiveIncomeNetOfTax

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