Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Operations of the Company's operating segments
Net Sales to External Customers	$ 608,834	$ 578,680	$ 1,159,455	$ 1,103,033
Revenue Transactions With Other Operating Segments	0	0	0	0
Total net sales	608,834	578,680	1,159,455	1,103,033
Segment Profit	112,948	106,406	203,901	191,839
Goodwill	457,759	447,166	457,759	447,166	455,842
US Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	193,353	186,829	357,347	345,013
Revenue Transactions With Other Operating Segments	21,136	16,694	41,912	35,273
Total net sales	214,489	203,523	399,259	380,286
Segment profit	34,723	33,339	58,418	57,996
Goodwill	307,975	307,933	307,975	307,933
Swiss Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	33,742	31,166	65,798	61,863
Revenue Transactions With Other Operating Segments	108,163	103,519	216,388	200,642
Total net sales	141,905	134,685	282,186	262,505
Segment profit	36,559	36,059	72,725	70,260
Goodwill	24,229	22,966	24,229	22,966
Western European Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	169,917	156,515	331,434	302,517
Revenue Transactions With Other Operating Segments	27,435	26,481	56,874	54,593
Total net sales	197,352	182,996	388,308	357,110
Segment profit	23,685	23,357	44,561	41,655
Goodwill	109,921	102,114	109,921	102,114
Chinese Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	99,922	97,771	191,543	188,498
Revenue Transactions With Other Operating Segments	37,398	37,743	72,942	68,145
Total net sales	137,320	135,514	264,485	256,643
Segment profit	31,497	29,374	57,296	54,022
Goodwill	738	733	738	733
Other Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	111,900	106,399	213,333	205,142
Revenue Transactions With Other Operating Segments	1,947	1,509	3,082	2,929
Total net sales	113,847	107,908	216,415	208,071
Segment profit	10,929	9,431	20,088	18,918
Goodwill	14,896	13,420	14,896	13,420
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	(196,079)	(185,946)	(391,198)	(361,582)
Total net sales	(196,079)	(185,946)	(391,198)	(361,582)
Segment profit	(24,445)	(25,154)	(49,187)	(51,012)
Goodwill	$ 0	$ 0	$ 0	$ 0