Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Operations of the Company's operating segments
Net Sales to External Customers	$ 650,598	$ 604,154	$ 1,798,558	$ 1,721,912
Revenue Transactions With Other Operating Segments	0	0	0	0
Total net sales	650,598	604,154	1,798,558	1,721,912
Segment Profit	151,675	134,272	382,765	349,888
Goodwill	482,144	448,342	482,144	448,342	$ 446,284
US Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	235,715	217,831	640,618	600,917
Revenue Transactions With Other Operating Segments	20,151	21,221	61,884	62,353
Total net sales	255,866	239,052	702,502	663,270
Segment profit	43,779	40,547	114,046	101,964
Goodwill	356,089	317,525	356,089	317,525
Swiss Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	32,390	32,847	90,075	96,851
Revenue Transactions With Other Operating Segments	127,569	122,399	374,863	355,492
Total net sales	159,959	155,246	464,938	452,343
Segment profit	36,854	39,358	107,673	108,892
Goodwill	22,280	22,130	22,280	22,130
Western European Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	159,025	149,996	450,940	439,717
Revenue Transactions With Other Operating Segments	43,816	45,403	121,308	124,709
Total net sales	202,841	195,399	572,248	564,426
Segment profit	30,218	26,594	74,711	69,377
Goodwill	87,403	94,659	87,403	94,659
Chinese Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	99,349	96,717	277,182	274,178
Revenue Transactions With Other Operating Segments	62,368	57,544	166,948	160,724
Total net sales	161,717	154,261	444,130	434,902
Segment profit	51,669	44,958	134,229	119,571
Goodwill	669	709	669	709
Other Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	124,119	106,763	339,743	310,249
Revenue Transactions With Other Operating Segments	1,770	2,014	4,824	4,959
Total net sales	125,889	108,777	344,567	315,208
Segment profit	16,721	13,464	41,064	32,652
Goodwill	15,703	13,319	15,703	13,319
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	(255,674)	(248,581)	(729,827)	(708,237)
Total net sales	(255,674)	(248,581)	(729,827)	(708,237)
Segment profit	(27,566)	(30,649)	(88,958)	(82,568)
Goodwill	$ 0	$ 0	$ 0	$ 0