CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Net income (loss)	$ 63,715	$ (128,615)	$ (31,318)
Other comprehensive income (loss), net of tax
Net change in fair value of interest rate swaps, net of tax	0	239	103
Foreign currency translation adjustment, net of tax	1,458	(502)	(2,294)
Release of cumulative translation adjustment to loss from discontinued operations due to substantial liquidation of foreign entity	3,044	0	0
Total other comprehensive income (loss), net of tax	4,502	(263)	(2,191)
Comprehensive income (loss)	$ 68,217	$ (128,878)	$ (33,509)