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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Operations of the Company's operating segments          
Net Sales to External Customers $ 653,656 $ 608,286 $ 1,248,223 $ 1,147,960  
Revenue Transactions With Other Operating Segments 0 0 0 0  
Total net sales 653,656 608,286 1,248,223 1,147,960  
Segment Profit 148,546 129,077 275,882 231,090  
Goodwill 483,757 444,278 483,757 444,278 $ 476,378
US Operations [Member]          
Operations of the Company's operating segments          
Net Sales to External Customers 238,831 216,968 454,184 404,903  
Revenue Transactions With Other Operating Segments 23,092 22,102 45,505 41,733  
Total net sales 261,923 239,070 499,689 446,636  
Segment profit 45,147 41,112 83,969 70,267  
Goodwill 357,782 319,715 357,782 319,715  
Swiss Operations [Member]          
Operations of the Company's operating segments          
Net Sales to External Customers 32,287 30,720 62,034 57,685  
Revenue Transactions With Other Operating Segments 131,347 126,983 258,899 247,294  
Total net sales 163,634 157,703 320,933 304,979  
Segment profit 37,950 34,997 73,968 70,819  
Goodwill 22,544 22,105 22,544 22,105  
Western European Operations [Member]          
Operations of the Company's operating segments          
Net Sales to External Customers 151,161 154,264 298,484 291,915  
Revenue Transactions With Other Operating Segments 43,883 38,945 86,825 77,492  
Total net sales 195,044 193,209 385,309 369,407  
Segment profit 23,172 24,303 46,398 44,493  
Goodwill 87,388 87,452 87,388 87,452  
Chinese Operations [Member]          
Operations of the Company's operating segments          
Net Sales to External Customers 108,092 92,886 198,873 177,833  
Revenue Transactions With Other Operating Segments 57,036 58,655 109,969 104,581  
Total net sales 165,128 151,541 308,842 282,414  
Segment profit 54,128 45,934 98,787 82,560  
Goodwill 653 672 653 672  
Other Operations [Member]          
Operations of the Company's operating segments          
Net Sales to External Customers 123,285 113,448 234,648 215,624  
Revenue Transactions With Other Operating Segments 2,129 1,700 3,726 3,054  
Total net sales 125,414 115,148 238,374 218,678  
Segment profit 15,212 13,249 28,330 24,343  
Goodwill 15,390 14,334 15,390 14,334  
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 (257,487) (248,385) (504,924) (474,154)  
Total net sales (257,487) (248,385) (504,924) (474,154)  
Segment profit (27,063) (30,518) (55,570) (61,392)  
Goodwill $ 0 $ 0 $ 0 $ 0