Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements of Comprehensive (Loss) Income
Net (loss) income	$ (13,436)	$ 18,000	$ 13,739
Other comprehensive income (loss):
Change in fair value of interest rate swap, net of income taxes	773
Adjustment to defined benefit plan, net of income taxes	182	124	(21)
Total other comprehensive income (loss)	955	124	(21)
Comprehensive (loss) income	$ (12,481)	$ 18,124	$ 13,718