CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 4,369	$ (4,161)	$ (5,321)	$ (20,258)
Other comprehensive income (loss):
Unrealized gain on cash flow hedges, net of tax of $533, $0, $541, and $0, respectively	1,738		1,762
Unrealized gain (loss) on defined benefit plan, net of tax of $0, $0, $105, and $0 respectively	26	(17)	(240)	(51)
Total other comprehensive income (loss)	1,764	(17)	1,522	(51)
Comprehensive income (loss)	$ 6,133	$ (4,178)	$ (3,799)	$ (20,309)