Consolidated Statements of Comprehensive Income (Loss) (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 loss	$ (1,801)	$ (22,021)	$ (7,533)	$ (82,522)
Change in fair value of derivative instruments, accounted for as hedges, net of income tax expense (benefit) of ($10), $0, $179 and ($561), respectively	(17)	245	5,053	(1,175)
Comprehensive loss	$ (1,818)	$ (21,776)	$ (2,480)	$ (83,697)