Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Operations of the Company's operating segments
Net Sales to External Customers	$ 594,567	$ 539,674
Revenue Transactions With Other Operating Segments	0	0
Total net sales	594,567	539,674
Segment Profit	127,336	102,013
Goodwill	478,652	448,183	$ 476,378
Us Operations segment Member
Operations of the Company's operating segments
Net Sales to External Customers	215,353	187,934
Revenue Transactions With Other Operating Segments	22,412	20,315
Total net sales	237,765	208,249
Segment profit	38,822	29,265
Goodwill	357,526	319,715
Swiss Operations segment Member
Operations of the Company's operating segments
Net Sales to External Customers	29,747	26,989
Revenue Transactions With Other Operating Segments	127,553	116,927
Total net sales	157,300	143,916
Segment profit	36,018	35,072
Goodwill	21,771	22,241
Western European Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	147,323	137,628
Revenue Transactions With Other Operating Segments	42,942	34,474
Total net sales	190,265	172,102
Segment profit	23,226	19,699
Goodwill	83,777	91,482
Chinese Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	90,781	84,947
Revenue Transactions With Other Operating Segments	52,932	46,817
Total net sales	143,713	131,764
Segment profit	44,659	38,036
Goodwill	643	692
Other Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	111,363	102,176
Revenue Transactions With Other Operating Segments	1,597	1,354
Total net sales	112,960	103,530
Segment profit	13,118	11,094
Goodwill	14,935	14,053
Intersegment Elimination [Member]
Operations of the Company's operating segments
Net Sales to External Customers	0	0
Revenue Transactions With Other Operating Segments	(247,436)	(219,887)
Total net sales	(247,436)	(219,887)
Segment profit	(28,507)	(31,153)
Goodwill	$ 0	$ 0