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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Components of the provision for income taxes
Federal	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit
State	274	489
Deferred portion of income tax expense	(33,727)us-gaap_DeferredIncomeTaxExpenseBenefit	38,374us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense	$ (33,453)us-gaap_IncomeTaxExpenseBenefit	$ 38,863us-gaap_IncomeTaxExpenseBenefit
Effective tax rate	38.70%	37.20%

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

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

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