Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 121,729	$ 100,828	$ 29,781
Other comprehensive income, net of tax:
Net change in fair value of derivatives, net of tax expense of $35, $828 and $482, respectively	1,224	2,466	17,120
Net derivative loss reclassified into earnings	24,023	34,979	33,265
Other comprehensive income	25,247	37,445	50,385
Total comprehensive income	$ 146,976	$ 138,273	$ 80,166