Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 12,374	$ 27,091	$ 68,547	$ 27,353
Other comprehensive income (loss) - net of tax:
Adjustment to accrued pension liability	414	525	1,240	1,576
Change in unrealized net gain (loss) on foreign currency	4,641	(7,694)	(10,569)	(8,730)
Unrealized (loss) gain on designated derivatives	(1,004)	363	(8,537)	(4,114)
Other comprehensive income (loss)	4,051	(6,806)	(17,866)	(11,268)
Total comprehensive income	$ 16,425	$ 20,285	$ 50,681	$ 16,085