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Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Domestic	$ 13,495us-gaap_CurrentFederalTaxExpenseBenefit	$ 10,605us-gaap_CurrentFederalTaxExpenseBenefit	$ 9,273us-gaap_CurrentFederalTaxExpenseBenefit
Foreign	3,382us-gaap_CurrentForeignTaxExpenseBenefit	3,200us-gaap_CurrentForeignTaxExpenseBenefit	4,919us-gaap_CurrentForeignTaxExpenseBenefit
State	2,685us-gaap_CurrentStateAndLocalTaxExpenseBenefit	2,366us-gaap_CurrentStateAndLocalTaxExpenseBenefit	756us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Provision for current income tax expense (benefit)	19,562us-gaap_CurrentIncomeTaxExpenseBenefit	16,171us-gaap_CurrentIncomeTaxExpenseBenefit	14,948us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Domestic	(600)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(1,074)us-gaap_DeferredFederalIncomeTaxExpenseBenefit	(192)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Foreign	540us-gaap_DeferredForeignIncomeTaxExpenseBenefit	249us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(363)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
State	(48)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	(52)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit	150us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Provision for deferred income tax expense (benefit)	(108)us-gaap_DeferredIncomeTaxExpenseBenefit	(877)us-gaap_DeferredIncomeTaxExpenseBenefit	(405)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income taxes	$ 19,454us-gaap_IncomeTaxExpenseBenefit	$ 15,294us-gaap_IncomeTaxExpenseBenefit	$ 14,543us-gaap_IncomeTaxExpenseBenefit

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