Income Taxes - Components of the Provision for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current provision for income taxes:
Federal	$ 36,091us-gaap_CurrentFederalTaxExpenseBenefit	$ 19,708us-gaap_CurrentFederalTaxExpenseBenefit	$ 13,037us-gaap_CurrentFederalTaxExpenseBenefit
State	2,716	4,525	2,003
Foreign	3,306us-gaap_CurrentForeignTaxExpenseBenefit	413us-gaap_CurrentForeignTaxExpenseBenefit	308us-gaap_CurrentForeignTaxExpenseBenefit
Total current	42,113us-gaap_CurrentIncomeTaxExpenseBenefit	24,646us-gaap_CurrentIncomeTaxExpenseBenefit	15,348us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred tax benefit:
Federal	(7,028)	(8,059)	(3,525)
State	153	(938)	(342)
Foreign	(580)	166	145
Total deferred	(7,455)us-gaap_DeferredIncomeTaxExpenseBenefit	(8,831)us-gaap_DeferredIncomeTaxExpenseBenefit	(3,722)us-gaap_DeferredIncomeTaxExpenseBenefit
Total provision for income taxes	$ 34,658us-gaap_IncomeTaxExpenseBenefit	$ 15,815us-gaap_IncomeTaxExpenseBenefit	$ 11,626us-gaap_IncomeTaxExpenseBenefit

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

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