CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (5,857)	$ (6,946)	$ (62,278)	$ (3,056)
Other comprehensive income (loss):
Foreign currency translation adjustments	5,146	2,457	(4,811)	2,330
Pension liability adjustment, net of tax	0	19,159	331	19,374
Unrealized loss on hedging activities, net of tax	(685)	(1,351)	(239)	(2,026)
Comprehensive (loss) income	$ (1,396)	$ 13,319	$ (66,997)	$ 16,622