Other (Expense) / Income, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Nonoperating Income (Expense) [Abstract]
Foreign currency (loss) / gain	$ (3,303)	$ 3,067	$ 540
Interest income	137	1,190	4,221
Other	(204)	0	0
Other (expense) / income, net	$ (3,370)	$ 4,257	$ 4,761