Condensed Consolidated Statements of Comprehensive Income (Loss) - 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 income (loss)		$ 3,222	$ (5,982)	$ 3,824	$ (100,810)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment		2,412	(1,431)	5,528	(3,438)
Unrealized gain (loss) on cash flow hedges, net of tax expense (benefit) of $0, $88 and $0, ($815)		82	137	(119)	(1,286)
Reclassification of pension liability adjustments to earnings, net of tax expense of $0, $38 and $0, $115	[1]	114	73	335	223
Other comprehensive income (loss)		2,608	(1,221)	5,744	(4,501)
Comprehensive income (loss)		$ 5,830	$ (7,203)	$ 9,568	$ (105,311)

[1] Reclassifications out of accumulated other comprehensive loss for pension obligations are charged to selling and administrative expense.