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Income Taxes (Income Tax Components) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 31,071us-gaap_CurrentFederalTaxExpenseBenefit	$ 28,206us-gaap_CurrentFederalTaxExpenseBenefit	$ 17,332us-gaap_CurrentFederalTaxExpenseBenefit
State	5,571us-gaap_CurrentStateAndLocalTaxExpenseBenefit	5,278us-gaap_CurrentStateAndLocalTaxExpenseBenefit	2,782us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign	2,181us-gaap_CurrentForeignTaxExpenseBenefit	1,204us-gaap_CurrentForeignTaxExpenseBenefit	2,726us-gaap_CurrentForeignTaxExpenseBenefit
Total Current	38,823us-gaap_CurrentIncomeTaxExpenseBenefit	34,688us-gaap_CurrentIncomeTaxExpenseBenefit	22,840us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	15,960us-gaap_DeferredFederalIncomeTaxExpenseBenefit	4,244us-gaap_DeferredFederalIncomeTaxExpenseBenefit	6,235us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Foreign	(256)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(84)us-gaap_DeferredForeignIncomeTaxExpenseBenefit	(579)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total Deferred	15,704us-gaap_DeferredIncomeTaxExpenseBenefit	4,160us-gaap_DeferredIncomeTaxExpenseBenefit	5,656us-gaap_DeferredIncomeTaxExpenseBenefit
Total	$ 54,527us-gaap_IncomeTaxExpenseBenefit	$ 38,848us-gaap_IncomeTaxExpenseBenefit	$ 28,496us-gaap_IncomeTaxExpenseBenefit

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