Income Taxes (Summary of Income Tax Benefit (Provision)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Taxes [Abstract]
Total current income tax (provision) benefit	$ (517)	$ (4,233)	$ (2,347)	$ (5,005)
Total deferred income tax (provision) benefit	37,451	(721)	33,248	(20,101)
Income tax (provision) benefit	$ 36,934	$ (4,954)	$ 30,901	$ (25,106)