Income Taxes (Summary of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
(Loss) income before taxes	$ (73,495)	$ (30,782)	$ 10,507	$ 85,390
Income tax (benefit) expense	$ (17,775)	$ (10,078)	$ 3,794	$ 36,635
Effective income tax rate (as a percent)	(24.20%)	(32.70%)	36.10%	42.90%