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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Operations of the Company's operating segments            
Net Sales to External Customers $ 951,950 $ 807,357 $ 2,680,691 $ 2,147,192    
Revenue Transactions With Other Operating Segments 0 0 0 0    
Net Sales 951,950 807,357 2,680,691 2,147,192    
Segment Profit 272,810 229,978 738,738 547,899    
Goodwill 639,184   639,184   $ 550,270 $ 541,722
Swiss Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 41,850 38,848 121,967 99,693    
Revenue Transactions With Other Operating Segments 208,411 167,335 594,057 462,671    
Net Sales 250,261 206,183 716,024 562,364    
Segment profit 78,454 61,902 212,849 164,060    
Goodwill 23,319   23,319     23,353
Western European Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 198,632 177,630 592,704 480,006    
Revenue Transactions With Other Operating Segments 52,259 42,130 160,386 123,543    
Net Sales 250,891 219,760 753,090 603,549    
Segment profit 40,288 36,954 116,630 91,406    
Goodwill 91,228   91,228     88,292
Chinese Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 210,460 165,231 572,055 406,738    
Revenue Transactions With Other Operating Segments 79,001 54,314 220,608 148,794    
Net Sales 289,461 219,545 792,663 555,532    
Segment profit 108,636 81,055 275,323 190,560    
Goodwill 696   696     651
Other Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 164,300 146,700 461,988 391,059    
Revenue Transactions With Other Operating Segments 835 1,509 3,207 3,281    
Net Sales 165,135 148,209 465,195 394,340    
Segment profit 24,381 23,554 65,967 47,702    
Goodwill 14,999   14,999     15,056
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 (377,401) (296,145) (1,090,444) (823,050)    
Net Sales (377,401) (296,145) (1,090,444) (823,050)    
Segment profit (51,587) (38,980) (147,612) (108,841)    
Goodwill 0   0     0
US Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 336,708 278,948 931,977 769,696    
Revenue Transactions With Other Operating Segments 36,895 30,857 112,186 84,761    
Net Sales 373,603 309,805 1,044,163 854,457    
Segment profit 72,638 $ 65,493 215,581 $ 163,012    
Goodwill $ 508,942   $ 508,942     $ 414,370