Segment Reporting (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Operations of the Company's operating segments
Net Sales to External Customers	$ 804,390,000	$ 649,162,000
Revenue Transactions With Other Operating Segments	0	0
Net Sales	804,390,000	649,162,000
Segment Profit	210,672,000	141,278,000
Goodwill	640,687,000	536,895,000	$ 550,270,000
Us Operations segment Member
Operations of the Company's operating segments
Net Sales to External Customers	271,959,000	241,409,000
Revenue Transactions With Other Operating Segments	36,784,000	26,391,000
Net Sales	308,743,000	267,800,000
Segment profit	63,671,000	44,938,000
Goodwill	509,600,000	413,898,000
Swiss Operations segment Member
Operations of the Company's operating segments
Net Sales to External Customers	39,281,000	31,897,000
Revenue Transactions With Other Operating Segments	184,465,000	152,848,000
Net Sales	223,746,000	184,745,000
Segment profit	64,879,000	53,910,000
Goodwill	23,048,000	22,751,000
Western European Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	192,350,000	153,325,000
Revenue Transactions With Other Operating Segments	52,255,000	41,715,000
Net Sales	244,605,000	195,040,000
Segment profit	37,866,000	24,107,000
Goodwill	92,193,000	85,058,000
Chinese Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	156,074,000	100,599,000
Revenue Transactions With Other Operating Segments	69,078,000	48,749,000
Net Sales	225,152,000	149,348,000
Segment profit	72,024,000	45,550,000
Goodwill	683,000	619,000
Other Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	144,726,000	121,932,000
Revenue Transactions With Other Operating Segments	1,095,000	896,000
Net Sales	145,821,000	122,828,000
Segment profit	20,172,000	11,026,000
Goodwill	15,163,000	14,569,000
Intersegment Elimination [Member]
Operations of the Company's operating segments
Net Sales to External Customers	0	0
Revenue Transactions With Other Operating Segments	(343,677,000)	(270,599,000)
Net Sales	(343,677,000)	(270,599,000)
Segment profit	(47,940,000)	(38,253,000)
Goodwill	$ 0	$ 0