Income Taxes - Components of Expense and Earnings (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current Income Tax Expense (Benefit) [Abstract]
Federal	$ 8,086us-gaap_CurrentFederalTaxExpenseBenefit	$ 7,216us-gaap_CurrentFederalTaxExpenseBenefit	$ 3,318us-gaap_CurrentFederalTaxExpenseBenefit
State	796	263	(69)
Foreign	13,650us-gaap_CurrentForeignTaxExpenseBenefit	13,040us-gaap_CurrentForeignTaxExpenseBenefit	9,972us-gaap_CurrentForeignTaxExpenseBenefit
Current Income Tax Expense (Benefit), Total	22,532us-gaap_CurrentIncomeTaxExpenseBenefit	20,519us-gaap_CurrentIncomeTaxExpenseBenefit	13,221us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit) [Abstract]
Federal	2,548	155	4,409
State	57	138	(794)
Foreign	(1,598)	(323)	(1,261)
Income Tax Expense (Benefit), Total	23,539us-gaap_IncomeTaxExpenseBenefit	20,489us-gaap_IncomeTaxExpenseBenefit	15,575us-gaap_IncomeTaxExpenseBenefit
Components Of Earnings Before Taxes [Abstract]
Domestic	32,391	25,900	26,520
Foreign	45,902	46,926	36,428
Income before taxes and equity in net income of associated companies	$ 78,293	$ 72,826	$ 62,948

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Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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