Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 57,431	$ 27,437	$ 92,754	$ 83,729
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	569	705	1,725	9,074
Other comprehensive income	569	705	1,725	9,073
Total comprehensive income	$ 58,000	$ 28,142	$ 94,479	$ 92,802