Segment and Geographic Data (Operating Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Unallocated selling, general, and administrative expenses	$ (95,273)	$ (78,256)	$ (79,622)
Acquisition costs	(1,198)	0	(443)
Impairment of goodwill and indefinite-lived intangibles	(1,223)	(2,440)	0
Executive severance costs	0	0	(611)
Restructuring costs	(76)	(918)	(2,293)
Operating income	27,372	22,657	28,648
Corporate/ Other
Segment Reporting Information [Line Items]
Unallocated selling, general, and administrative expenses	(33,322)	(27,379)	(27,579)
Acquisition costs	0		0
Impairment of goodwill and indefinite-lived intangibles	0	0
Executive severance costs			(611)
Restructuring costs	0	(82)	(166)
Operating income	$ (35,819)	$ (30,737)	$ (30,926)