Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (186,019)	$ (237,203)	$ (32,417)
Other comprehensive income (loss) before tax:
Foreign currency translation adjustment	(2,213)	3,697	3,865
Foreign currency hedge	0	(1,198)	282
Defined benefit pension plans
Net actuarial gain (loss) arising during period	4,048	0	(421)
Settlement cost during period	67	0	226
Amortization of prior service cost	33	0	33
Other comprehensive income (loss)	1,935	2,499	3,985
Tax (provision) benefit attributable to other comprehensive income (loss)	(989)	13	217
Other comprehensive income (loss), net of tax	946	2,512	4,202
Total comprehensive loss	$ (185,073)	$ (234,691)	$ (28,215)