Consolidated Statements of Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (1,326)	$ (2,100)	$ (2,253)	$ (5,733)
Change in fair value of derivative instruments, accounted for as hedges, net of income tax expense (benefit) of $172, $189, ($106) and $189, respectively	(84)	1,882	(1,080)	5,070
Comprehensive loss	$ (1,410)	$ (218)	$ (3,333)	$ (663)