Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - 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 income	$ 32,662	$ 4,891	$ 56,173	$ 262
Other comprehensive income (loss) - net of tax:
Adjustment to accrued pension liability	412	527	826	1,051
Change in unrealized net loss on foreign currency	10,337	(2,257)	(15,210)	(1,036)
Unrealized loss on designated derivatives	(3,494)	(1,763)	(7,533)	(4,477)
Other comprehensive income (loss)	7,255	(3,493)	(21,917)	(4,462)
Total comprehensive income (loss)	$ 39,917	$ 1,398	$ 34,256	$ (4,200)