Income Taxes - Components of Income Tax Expense (Benefit) Table (details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current Income Tax Expense (Benefit) [Abstract]
Federal income tax expense (benefit)	$ (625)us-gaap_CurrentFederalTaxExpenseBenefit	$ (30,222)us-gaap_CurrentFederalTaxExpenseBenefit	$ 48,223us-gaap_CurrentFederalTaxExpenseBenefit
State income tax expense (benefit)	69	636	2,924
Total current income tax expense (benefit)	(556)us-gaap_CurrentIncomeTaxExpenseBenefit	(29,586)us-gaap_CurrentIncomeTaxExpenseBenefit	51,147us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit) [Abstract]
Federal income tax expense (benefit)	171	32,930	(9,144)
State income tax expense (benefit)	2,412	(1,039)	6,881
Total deferred income tax expense (benefit)	2,583us-gaap_DeferredIncomeTaxExpenseBenefit	31,891us-gaap_DeferredIncomeTaxExpenseBenefit	(2,263)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense	$ 2,027us-gaap_IncomeTaxExpenseBenefit	$ 2,305us-gaap_IncomeTaxExpenseBenefit	$ 48,884us-gaap_IncomeTaxExpenseBenefit

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

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

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

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

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

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.