Consolidated Statements of Comprehensive Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (4,385,448)	$ 635,491	$ 409,597
Other comprehensive income, net of income tax
Interest rate lock derivative contracts reclassified to income, net of tax of $128, $45 and $40, respectively	209	67	72
Total other comprehensive income	209	67	72
Comprehensive income (loss)	$ (4,385,239)	$ 635,558	$ 409,669