Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Operations of the Company's operating segments
Net Sales to External Customers	$ 698,799	$ 650,598	$ 1,947,022	$ 1,798,558
Revenue Transactions With Other Operating Segments	0	0	0	0
Total net sales	698,799	650,598	1,947,022	1,798,558
Segment Profit	162,885	151,675	438,767	382,765
Goodwill	538,418	482,144	538,418	482,144	$ 476,378
US Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	239,221	235,715	693,405	640,618
Revenue Transactions With Other Operating Segments	24,187	20,151	69,692	61,884
Total net sales	263,408	255,866	763,097	702,502
Segment profit	43,004	43,779	126,973	114,046
Goodwill	409,172	356,089	409,172	356,089
Swiss Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	33,923	32,390	95,957	90,075
Revenue Transactions With Other Operating Segments	136,960	127,569	395,859	374,863
Total net sales	170,883	159,959	491,816	464,938
Segment profit	39,213	36,854	113,181	107,673
Goodwill	22,252	22,280	22,252	22,280
Western European Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	171,722	159,025	470,206	450,940
Revenue Transactions With Other Operating Segments	40,287	43,816	127,112	121,308
Total net sales	212,009	202,841	597,318	572,248
Segment profit	30,885	30,218	77,283	74,711
Goodwill	90,832	87,403	90,832	87,403
Chinese Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	125,067	99,349	323,940	277,182
Revenue Transactions With Other Operating Segments	68,625	62,368	178,593	166,948
Total net sales	193,692	161,717	502,533	444,130
Segment profit	69,086	51,669	167,873	134,229
Goodwill	673	669	673	669
Other Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	128,866	124,119	363,514	339,743
Revenue Transactions With Other Operating Segments	1,754	1,770	5,481	4,824
Total net sales	130,620	125,889	368,995	344,567
Segment profit	16,776	16,721	45,106	41,064
Goodwill	15,489	15,703	15,489	15,703
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	(271,813)	(255,674)	(776,737)	(729,827)
Total net sales	(271,813)	(255,674)	(776,737)	(729,827)
Segment profit	(36,079)	(27,566)	(91,649)	(88,958)
Goodwill	$ 0	$ 0	$ 0	$ 0

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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