Segment Reporting Textuals - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Operating Lease, Right-of-Use Asset				$ 92,700
Restructuring Charges	$ 10,516	$ 15,760	$ 18,420
Maximum Customer Percentage	1.00%
U.S. Operations Segment
Operating Lease, Right-of-Use Asset	$ 35,500	38,300
Restructuring Charges	3,200	4,200	11,000
Swiss Operations Segment
Operating Lease, Right-of-Use Asset	2,300	1,300
Restructuring Charges	1,000	3,400	4,000
Western European Operations Segment
Operating Lease, Right-of-Use Asset	28,900	20,100
Restructuring Charges	5,200	6,900	2,800
Chinese Operations Segment
Operating Lease, Right-of-Use Asset	2,900	3,000
Restructuring Charges	200	500	300
Other Operations Segment
Operating Lease, Right-of-Use Asset	25,900	22,700
Restructuring Charges	900	800	$ 300
Eliminations and Corporate Segment
Operating Lease, Right-of-Use Asset	$ 3,100	$ 1,900