Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Operations of the Company's operating segments
Net Sales to External Customers	$ 660,821	$ 594,567
Revenue Transactions With Other Operating Segments	0	0
Total net sales	660,821	594,567
Segment Profit	139,546	126,533
Goodwill	544,784	478,652	$ 539,838
Us Operations segment Member
Operations of the Company's operating segments
Net Sales to External Customers	229,745	215,353
Revenue Transactions With Other Operating Segments	23,666	22,412
Total net sales	253,411	237,765
Segment profit	34,245	38,822
Goodwill	409,471	357,526
Swiss Operations segment Member
Operations of the Company's operating segments
Net Sales to External Customers	32,466	29,747
Revenue Transactions With Other Operating Segments	143,582	127,553
Total net sales	176,048	157,300
Segment profit	45,975	36,018
Goodwill	22,866	21,771
Western European Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	165,372	147,323
Revenue Transactions With Other Operating Segments	41,012	42,942
Total net sales	206,384	190,265
Segment profit	18,282	24,718
Goodwill	95,938	83,777
Chinese Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	113,930	90,781
Revenue Transactions With Other Operating Segments	60,407	52,932
Total net sales	174,337	143,713
Segment profit	59,553	44,659
Goodwill	722	643
Other Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	119,308	111,363
Revenue Transactions With Other Operating Segments	1,640	1,597
Total net sales	120,948	112,960
Segment profit	13,881	13,108
Goodwill	15,787	14,935
Intersegment Elimination [Member]
Operations of the Company's operating segments
Net Sales to External Customers	0	0
Revenue Transactions With Other Operating Segments	(270,307)	(247,436)
Total net sales	(270,307)	(247,436)
Segment profit	(32,390)	(30,792)
Goodwill	$ 0	$ 0