Income Taxes (Summary of Income Tax Benefit (Provision)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Taxes [Abstract]
Total current income tax (provision) benefit	$ (713)	$ (517)	$ (2,056)	$ (2,347)
Total deferred income tax (provision) benefit	(8,198)	37,451	(29,010)	33,248
Income tax (provision) benefit	$ (8,911)	$ 36,934	$ (31,066)	$ 30,901