Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (2,100)	$ (22,858)	$ (5,733)	$ (60,501)
Change in fair value of derivative instruments, accounted for as hedges, net of income tax expense (benefit) of $189, ($475), $189 and ($561), respectively	1,882	(1,275)	5,070	(1,420)
Comprehensive loss	$ (218)	$ (24,133)	$ (663)	$ (61,921)