Consolidated Statements of Comprehensive Loss - 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	$ (55,627)	$ (10,476)	$ (66,951)	$ (24,572)
Other comprehensive income (loss), net of tax:
Currency translation adjustments (net of income tax of $0 in 2020 and 2019)	30,008	7,452	1,830	3,245
Change in unrecognized net periodic pension costs (net of income tax of $44 and $88 in 2020, and $63 and $126 in 2019)	595	197	765	394
Net unrealized loss on derivative instruments and other (net of income tax benefit of $238 and $4,064 in 2020, and $2,662 and $3,641 in 2019)	(76)	(5,262)	(11,473)	(7,675)
Total other comprehensive income (loss), net of tax	30,527	2,387	(8,878)	(4,036)
Comprehensive loss	$ (25,100)	$ (8,089)	$ (75,829)	$ (28,608)