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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 41,151us-gaap_NetIncomeLoss	$ 36,094us-gaap_NetIncomeLoss	$ 28,903us-gaap_NetIncomeLoss
Other comprehensive income (loss):
Foreign currency translation adjustment	(16,331)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	479us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	4,445us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Net (loss) gain on pension and other postretirement benefits	(4,938)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	6,706us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	(574)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Other comprehensive (loss) income before income tax (benefit) expense	(21,269)us-gaap_OtherComprehensiveIncomeLossBeforeTax	7,185us-gaap_OtherComprehensiveIncomeLossBeforeTax	3,871us-gaap_OtherComprehensiveIncomeLossBeforeTax
Income tax benefit (expense) related to items of other comprehensive income (loss)	1,872us-gaap_OtherComprehensiveIncomeLossTax	(2,516)us-gaap_OtherComprehensiveIncomeLossTax	121us-gaap_OtherComprehensiveIncomeLossTax
Other comprehensive (loss) income	(19,397)us-gaap_OtherComprehensiveIncomeLossNetOfTax	4,669us-gaap_OtherComprehensiveIncomeLossNetOfTax	3,992us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income	$ 21,754us-gaap_ComprehensiveIncomeNetOfTax	$ 40,763us-gaap_ComprehensiveIncomeNetOfTax	$ 32,895us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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