Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 29,871	$ (62,371)
Other comprehensive income (loss), net of tax:
Currency translation adjustments	25,283	7,250
Change in unrecognized net periodic pension costs (net of income tax benefit of $1,579 in 2020 and $2,299 in 2019)	(3,756)	(6,545)
Net unrealized loss on derivative instruments and other (net of income tax benefit of $3,180 in 2020 and $3,305 in 2019)	(7,329)	(7,800)
Other comprehensive income (loss)	14,198	(7,095)
Comprehensive income (loss)	$ 44,069	$ (69,466)