Consolidated Statements of Comprehensive Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (976,177)	$ (4,385,448)	$ 635,491
Other comprehensive income, net of income tax
Interest rate lock derivative contracts reclassified to income, net of tax of $0, $128 and $45, respectively	0	209	67
Total other comprehensive income	0	209	67
Comprehensive income (loss)	$ (976,177)	$ (4,385,239)	$ 635,558