Business Information - Information by Geographic Region, After Elimination of All Significant Inter-company Accounts and Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 317,539	$ 311,678	$ 301,012
Operating income (loss)	71,257	55,248	45,843
Total assets	568,632	585,799	494,375
North America
Segment Reporting Information [Line Items]
Revenues	204,989	167,038	212,916
Operating income (loss)	65,618	(5,238)	38,116
Total assets	247,383	297,579	196,603
Europe
Segment Reporting Information [Line Items]
Revenues	70,466	127,631	46,827
Operating income (loss)	(9,252)	62,603	(9,964)
Total assets	153,716	138,632	129,725
Rest of World
Segment Reporting Information [Line Items]
Revenues	42,084	17,009	41,269
Operating income (loss)	14,891	(2,117)	17,691
Total assets	$ 167,533	$ 149,588	$ 168,047