Income Taxes (Income Tax Provision (Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current income tax expense (benefit)
Federal	$ 393	$ 57,720	$ (12,552)
State	9,864	18,034	20,801
Total current income tax expense	10,257	75,754	8,249
Deferred income tax expense (benefit)
Federal	222,559	239,862	329,715
State	(33)	15,881	12,748
Total deferred income tax expense	222,526	255,743	342,463
Total income tax expense	$ 232,783	$ 331,497	$ 350,712

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.