Income Taxes (Components of Income Tax Provision) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 21,468us-gaap_CurrentFederalTaxExpenseBenefit	$ 15,225us-gaap_CurrentFederalTaxExpenseBenefit	$ 12,072us-gaap_CurrentFederalTaxExpenseBenefit
State	684	3,322	1,450
Foreign	1,627us-gaap_CurrentForeignTaxExpenseBenefit	1,432us-gaap_CurrentForeignTaxExpenseBenefit	891us-gaap_CurrentForeignTaxExpenseBenefit
Total current	23,779us-gaap_CurrentIncomeTaxExpenseBenefit	19,979us-gaap_CurrentIncomeTaxExpenseBenefit	14,413us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	2,573	1,336	(18,836)
State	(1,071)	(543)	90
Total deferred	1,502us-gaap_DeferredIncomeTaxExpenseBenefit	793us-gaap_DeferredIncomeTaxExpenseBenefit	(18,746)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense (benefit)	$ 25,281us-gaap_IncomeTaxExpenseBenefit	$ 20,772us-gaap_IncomeTaxExpenseBenefit	$ (4,333)us-gaap_IncomeTaxExpenseBenefit

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