Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (59,796)	$ 10,879	$ (180,756)	$ 22,202
Change in fair value of derivative instruments, accounted for as hedges, net of income tax benefit of $2,046, $0, $1,099, and $0, respectively	(3,454)	860	(1,856)	(2,558)
Comprehensive income (loss)	$ (63,250)	$ 11,739	$ (182,612)	$ 19,644