Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current income tax provision (benefit)
Federal alternative minimum tax	$ 133us-gaap_CurrentFederalTaxExpenseBenefit	$ 404us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit
Net current income tax provision	133us-gaap_CurrentIncomeTaxExpenseBenefit	404us-gaap_CurrentIncomeTaxExpenseBenefit	0us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax provision (benefit)
Federal tax expense at statutory rate	61,301	19,177	(11,767)
State income tax	2,707	431	(819)
Nondeductible expense	0	0	(122)
Permanent differences	397	319	1,018
Federal alternative minimum tax	(133)	(404)	0
Change in federal valuation allowance	0	(8,885)	10,260
Change in state valuation allowance	(30)	(1,345)	0
Net deferred income tax provision (benefit)	64,242us-gaap_DeferredIncomeTaxExpenseBenefit	9,293us-gaap_DeferredIncomeTaxExpenseBenefit	(1,430)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax provision (benefit)	$ 64,375us-gaap_IncomeTaxExpenseBenefit	$ 9,697us-gaap_IncomeTaxExpenseBenefit	$ (1,430)us-gaap_IncomeTaxExpenseBenefit
Federal statutory rate	35.00%	34.00%	34.00%

Effective Income Tax Rate Reconciliation, Change in State Deferred Tax Assets Valuation Allowance, Amount

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Income tax reconciliation income federal alternative minimum tax.

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

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