Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Operations of the Company's operating segments
Net Sales to External Customers	$ 578,680	$ 570,283	$ 1,103,033	$ 1,105,683
Revenue Transactions With Other Operating Segments	0	0	0	0
Total net sales	578,680	570,283	1,103,033	1,105,683
Segment Profit	106,406	101,057	191,839	181,851
Goodwill	447,166	446,280	447,166	446,280	452,351
US Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	187,395	177,182	345,781	334,480
Revenue Transactions With Other Operating Segments	16,897	16,626	35,273	34,737
Total net sales	204,292	193,808	381,054	369,217
Segment profit	33,481	35,403	58,124	59,360
Goodwill	307,933	307,618	307,933	307,618
Swiss Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	31,166	28,420	61,863	60,025
Revenue Transactions With Other Operating Segments	103,519	93,750	200,642	191,269
Total net sales	134,685	122,170	262,505	251,294
Segment profit	37,171	26,312	72,574	55,454
Goodwill	22,966	22,530	22,966	22,530
Western European Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	156,796	156,284	302,964	309,289
Revenue Transactions With Other Operating Segments	26,481	24,838	54,593	48,685
Total net sales	183,277	181,122	357,557	357,974
Segment profit	23,494	21,978	41,792	40,243
Goodwill	102,114	100,859	102,114	100,859
Chinese Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	97,771	108,479	188,498	199,773
Revenue Transactions With Other Operating Segments	37,743	26,122	68,145	55,935
Total net sales	135,514	134,601	256,643	255,708
Segment profit	29,374	30,931	54,022	56,249
Goodwill	733	716	733	716
Other Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	105,552	99,918	203,927	202,116
Revenue Transactions With Other Operating Segments	1,509	1,345	2,929	2,994
Total net sales	107,061	101,263	206,856	205,110
Segment profit	9,166	8,506	18,653	18,830
Goodwill	13,420	14,557	13,420	14,557
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	(186,149)	(162,681)	(361,582)	(333,620)
Total net sales	(186,149)	(162,681)	(361,582)	(333,620)
Segment profit	(26,280)	(22,073)	(53,326)	(48,285)
Goodwill	$ 0	$ 0	$ 0	$ 0