Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (7,116)	$ 20,030	$ 35,323	$ 56,292
Other comprehensive income, net of tax:
Net change in fair value of derivatives, net of tax expense of $0 for all periods presented	0	0	0	(1)
Net derivative loss reclassified into earnings	575	2,997	1,156	8,369
Other comprehensive income	575	2,997	1,156	8,368
Total comprehensive income (loss)	$ (6,541)	$ 23,027	$ 36,479	$ 64,660