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Income Taxes, Expense (Benefit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income tax expense (benefit)
Current federal income tax expense (benefit)	$ (77,931)us-gaap_CurrentFederalTaxExpenseBenefit	$ 180,056us-gaap_CurrentFederalTaxExpenseBenefit	$ 10,547us-gaap_CurrentFederalTaxExpenseBenefit
Current state income tax expense	8,545	8,426	4,186
Deferred federal income tax expense (benefit)	44,881	(69,917)	54,490
Deferred state income tax expense (benefit)	6,276	(5,431)	(5,246)
State - valuation allowance adjustment	6,447
Total income tax expense (benefit)	$ (11,782)us-gaap_IncomeTaxExpenseBenefit	$ 113,134us-gaap_IncomeTaxExpenseBenefit	$ 63,977us-gaap_IncomeTaxExpenseBenefit

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 federal 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.