Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 27,437	$ (13,989)	$ 83,729	$ 71,088
Other comprehensive income, net of tax:
Net change in fair value of derivatives, net of tax expense of $0 and $3 for the three months ended and tax expense of $0 and $26 for the nine months ended September 30, 2016 and 2015, respectively	0	272	(1)	708
Net derivative loss reclassified into earnings	705	5,006	9,074	19,349
Other comprehensive income	705	5,278	9,073	20,057
Total comprehensive income (loss)	$ 28,142	$ (8,711)	$ 92,802	$ 91,145