Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Operations of the Company's operating segments
Net Sales to External Customers	$ 582,057	$ 608,834	$ 1,117,758	$ 1,159,455
Revenue Transactions With Other Operating Segments	0	0	0	0
Total net sales	582,057	608,834	1,117,758	1,159,455
Segment Profit	118,310	112,948	215,616	203,901
Goodwill	442,482		442,482		$ 444,085	$ 457,759
US Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	203,352	193,354	381,572	357,348
Revenue Transactions With Other Operating Segments	22,840	21,136	41,132	41,912
Total net sales	226,192	214,490	422,704	399,260
Segment profit	36,964	32,383	61,190	54,020
Goodwill	308,863		308,863			307,975
Swiss Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	33,234	34,141	64,458	67,147
Revenue Transactions With Other Operating Segments	102,019	108,163	201,802	216,388
Total net sales	135,253	142,304	266,260	283,535
Segment profit	33,654	31,917	70,224	64,145
Goodwill	23,198		23,198			24,229
Western European Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	150,143	169,517	292,219	330,084
Revenue Transactions With Other Operating Segments	27,540	27,435	54,900	56,874
Total net sales	177,683	196,952	347,119	386,958
Segment profit	23,346	23,685	43,687	44,561
Goodwill	96,552		96,552			109,921
Chinese Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	91,012	99,922	177,461	191,543
Revenue Transactions With Other Operating Segments	45,250	37,398	88,755	72,942
Total net sales	136,262	137,320	266,216	264,485
Segment profit	36,179	38,488	69,415	70,284
Goodwill	746		746			738
Other Operations [Member]
Operations of the Company's operating segments
Net Sales to External Customers	104,316	111,900	202,048	213,333
Revenue Transactions With Other Operating Segments	1,588	1,947	2,945	3,082
Total net sales	105,904	113,847	204,993	216,415
Segment profit	9,990	10,929	18,972	20,088
Goodwill	13,123		13,123			14,896
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	(199,237)	(196,079)	(389,534)	(391,198)
Total net sales	(199,237)	(196,079)	(389,534)	(391,198)
Segment profit	(21,823)	$ (24,454)	(47,872)	$ (49,197)
Goodwill	$ 0		$ 0			$ 0