Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Components of the provision for income taxes
Federal	$ 0	$ 0
State	164	274
Deferred portion of income tax expense (benefit)	(195,039)	(33,727)
Total income tax expense (benefit)	$ (194,875)	$ (33,453)
Effective tax rate	35.90%	38.70%