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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Operations of the Company's operating segments          
Net Sales to External Customers $ 753,866 $ 734,846 $ 2,164,684 $ 2,117,663  
Revenue Transactions With Other Operating Segments 0 0 0 0  
Net Sales 753,866 734,846 2,164,684 2,117,663  
Segment Profit 196,215 181,965 521,797 490,797  
Goodwill 531,224 537,862 531,224 537,862 $ 534,780
US Operations [Member]          
Operations of the Company's operating segments          
Net Sales to External Customers 269,038 255,379 771,578 736,598  
Revenue Transactions With Other Operating Segments 28,075 25,050 80,791 72,203  
Net Sales 297,113 280,429 852,369 808,801  
Segment profit 54,628 41,890 146,599 118,141  
Goodwill 410,021 410,022 410,021 410,022  
Swiss Operations [Member]          
Operations of the Company's operating segments          
Net Sales to External Customers 33,415 31,463 98,350 96,082  
Revenue Transactions With Other Operating Segments 160,736 148,418 466,398 440,959  
Net Sales 194,151 179,881 564,748 537,041  
Segment profit 54,226 44,542 156,361 138,254  
Goodwill 21,803 22,404 21,803 22,404  
Western European Operations [Member]          
Operations of the Company's operating segments          
Net Sales to External Customers 168,652 173,170 498,240 512,314  
Revenue Transactions With Other Operating Segments 42,794 41,923 126,050 128,076  
Net Sales 211,446 215,093 624,290 640,390  
Segment profit 29,888 30,046 77,842 75,661  
Goodwill 83,971 89,915 83,971 89,915  
Chinese Operations [Member]          
Operations of the Company's operating segments          
Net Sales to External Customers 142,292 140,098 400,473 387,301  
Revenue Transactions With Other Operating Segments 60,710 64,079 170,135 183,074  
Net Sales 203,002 204,177 570,608 570,375  
Segment profit 72,745 75,762 197,718 201,199  
Goodwill 615 644 615 644  
Other Operations [Member]          
Operations of the Company's operating segments          
Net Sales to External Customers 140,469 134,736 396,043 385,368  
Revenue Transactions With Other Operating Segments 1,513 1,334 4,108 4,436  
Net Sales 141,982 136,070 400,151 389,804  
Segment profit 17,938 19,179 45,425 50,702  
Goodwill 14,814 14,877 14,814 14,877  
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 (293,828) (280,804) (847,482) (828,748)  
Net Sales (293,828) (280,804) (847,482) (828,748)  
Segment profit (33,210) (29,454) (102,148) (93,160)  
Goodwill $ 0 $ 0 $ 0 $ 0