Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Sep. 30, 2020
Operations of the Company's operating segments
Net Sales to External Customers	$ 978,387	$ 924,351	$ 1,876,178	$ 1,728,741
Revenue Transactions With Other Operating Segments	0	0	0	0
Net Sales	978,387	924,351	1,876,178	1,728,741
Segment Profit	285,432	255,256	526,677	465,928
Goodwill	643,449		643,449		$ 648,622	$ 642,186
Swiss Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	42,062	40,836	85,331	80,117
Revenue Transactions With Other Operating Segments	210,449	201,182	404,284	385,647
Net Sales	252,511	242,018	489,615	465,764
Segment profit	72,012	69,516	143,334	134,395
Goodwill	22,634		22,634			23,553
Western European Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	190,264	201,722	383,149	394,072
Revenue Transactions With Other Operating Segments	47,474	55,873	97,601	108,128
Net Sales	237,738	257,595	480,751	502,200
Segment profit	35,233	38,476	74,013	76,342
Goodwill	92,215		92,215			93,133
Chinese Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	229,809	205,521	412,515	361,595
Revenue Transactions With Other Operating Segments	75,123	72,529	155,562	141,607
Net Sales	304,932	278,050	568,077	503,202
Segment profit	105,456	94,663	190,424	166,687
Goodwill	665		665			697
Other Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	155,107	152,962	308,217	297,688
Revenue Transactions With Other Operating Segments	709	1,275	1,673	2,371
Net Sales	155,816	154,237	309,888	300,059
Segment profit	22,243	21,414	42,695	41,586
Goodwill	13,878		13,878			15,203
Intersegment Elimination [Member]
Operations of the Company's operating segments
Net Sales to External Customers	0	0	0	0
Revenue Transactions With Other Operating Segments	(374,069)	(369,366)	(739,007)	(713,045)
Net Sales	(374,069)	(369,366)	(739,007)	(713,045)
Segment profit	(42,308)	(48,085)	(91,771)	(96,025)
Goodwill	0		0			0
US Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	361,145	323,310	686,966	595,269
Revenue Transactions With Other Operating Segments	40,314	38,507	79,887	75,292
Net Sales	401,459	361,817	766,854	670,561
Segment profit	92,796	$ 79,272	167,982	$ 142,943
Goodwill	$ 514,057		$ 514,057			$ 509,600