Consolidated Statements of Comprehensive Income (Loss) - 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 loss	$ (22,021)	$ (50,623)	$ (82,522)	$ (231,379)
Change in fair value of derivative instruments, accounted for as hedges, net of income tax benefit of $0, $6, $561 and $1,105, respectively	245	(10)	(1,175)	(1,866)
Comprehensive loss	$ (21,776)	$ (50,633)	$ (83,697)	$ (233,245)