Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Operations of the Company's operating segments
Net Sales to External Customers	$ 604,154	$ 629,100	$ 1,721,912	$ 1,788,555
Revenue Transactions With Other Operating Segments	0	0	0	0
Total net sales	604,154	629,100	1,721,912	1,788,555
Segment Profit	134,272	126,700	349,888	330,601
Goodwill	448,342	449,539	448,342	449,539	$ 444,085
US Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	217,713	196,241	599,283	553,590
Revenue Transactions With Other Operating Segments	21,221	20,058	62,353	61,969
Total net sales	238,934	216,299	661,636	615,559
Segment profit	40,529	30,695	101,719	84,715
Goodwill	317,525	308,112	317,525	308,112
Swiss Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	32,867	35,375	97,325	102,522
Revenue Transactions With Other Operating Segments	107,196	112,544	308,998	328,932
Total net sales	140,063	147,919	406,323	431,454
Segment profit	39,772	35,924	109,996	100,069
Goodwill	22,130	22,748	22,130	22,748
Western European Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	150,523	174,089	442,742	504,172
Revenue Transactions With Other Operating Segments	32,495	32,076	87,395	88,950
Total net sales	183,018	206,165	530,137	593,122
Segment profit	26,789	29,612	70,476	74,173
Goodwill	94,659	103,844	94,659	103,844
Chinese Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	96,716	107,907	274,178	299,450
Revenue Transactions With Other Operating Segments	49,499	41,416	138,253	114,358
Total net sales	146,215	149,323	412,431	413,808
Segment profit	41,665	43,472	111,080	113,756
Goodwill	709	741	709	741
Other Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	106,335	115,488	308,384	328,821
Revenue Transactions With Other Operating Segments	2,014	1,864	4,959	4,946
Total net sales	108,349	117,352	313,343	333,767
Segment profit	13,400	13,148	32,372	33,236
Goodwill	13,319	14,094	13,319	14,094
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	(212,425)	(207,958)	(601,958)	(599,155)
Total net sales	(212,425)	(207,958)	(601,958)	(599,155)
Segment profit	(27,883)	(26,151)	(75,755)	(75,348)
Goodwill	$ 0	$ 0	$ 0	$ 0