Other Income (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Income and Expenses [Abstract]
Income from third party license fees	$ 314	$ 190	$ 1,026	$ 702
Foreign exchange gains (losses), net	368	(1,897)	(1,948)	(3,080)
Gain (loss) on fixed asset disposals, net	(537)	(24)	4,819	(105)
Non-income tax refunds and other related credits	3	0	14,395	2,131
Pension and post retirement benefit costs, non-service components	343	1,375	596	(22,491)
Other Operating Income Expense Net	156	117	456	436
Total other income (expense), net	$ 647	$ (239)	$ 19,344	$ (22,407)