Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ 44,129	$ 46,081	$ 179,614	$ (20,871)
Other comprehensive income (loss), net of tax:
Currency translation adjustments	(12,014)	5,173	(26,724)	7,003
Change in unrecognized net periodic pension costs	395	167	552	932
Change in gains and losses on derivative instruments	0	1,681	20,044	(9,792)
Total other comprehensive income (loss), net of tax	(11,619)	7,021	(6,128)	(1,857)
Comprehensive income (loss)	$ 32,510	$ 53,102	$ 173,486	$ (22,728)