Taxes (Schedule of Components of Income Tax) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Taxes [Abstract]
Current Federal Tax Expense (Benefit)	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ (20,022)us-gaap_CurrentFederalTaxExpenseBenefit
Current State and Local Tax Expense (Benefit)	25	(647)	575
Current Income Tax Expense (Benefit)	25us-gaap_CurrentIncomeTaxExpenseBenefit	(647)us-gaap_CurrentIncomeTaxExpenseBenefit	(19,447)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Federal Income Tax Expense (Benefit)	18,535	(318,956)	(341,486)
Deferred State and Local Income Tax Expense (Benefit)	7,074	(15,895)	7,026
Deferred Income Tax Expense (Benefit)	25,609us-gaap_DeferredIncomeTaxExpenseBenefit	(334,851)us-gaap_DeferredIncomeTaxExpenseBenefit	(334,460)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for (benefit from) income taxes	$ 25,634us-gaap_IncomeTaxExpenseBenefit	$ (335,498)us-gaap_IncomeTaxExpenseBenefit	$ (353,907)us-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.