Income Taxes - Provision for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ (31,111)us-gaap_CurrentFederalTaxExpenseBenefit	$ 11,319us-gaap_CurrentFederalTaxExpenseBenefit	$ 10,699us-gaap_CurrentFederalTaxExpenseBenefit
Foreign	230us-gaap_CurrentForeignTaxExpenseBenefit	217us-gaap_CurrentForeignTaxExpenseBenefit	142us-gaap_CurrentForeignTaxExpenseBenefit
State	4,618	3,081	1,845
Current tax expense (benefit)	(26,263)us-gaap_CurrentIncomeTaxExpenseBenefit	14,617us-gaap_CurrentIncomeTaxExpenseBenefit	12,686us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	38,297	(5,659)	6,610
State	5,545	(1,021)	1,048
Deferred income taxes	43,842us-gaap_DeferredIncomeTaxExpenseBenefit	(6,680)us-gaap_DeferredIncomeTaxExpenseBenefit	7,658us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense	$ 17,579us-gaap_IncomeTaxExpenseBenefit	$ 7,937us-gaap_IncomeTaxExpenseBenefit	$ 20,344us-gaap_IncomeTaxExpenseBenefit

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

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