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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Operations of the Company's operating segments            
Net Sales to External Customers $ 954,535 $ 942,462 $ 2,827,234 $ 2,853,317    
Revenue Transactions With Other Operating Segments 0 0 0 0    
Net Sales 954,535 942,462 2,827,234 2,853,317    
Segment Profit 296,573 295,965 848,002 870,120    
Goodwill 672,404   672,404   $ 670,108 $ 660,638
Swiss Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 53,435 50,233 157,870 143,405    
Revenue Transactions With Other Operating Segments 188,956 196,967 581,521 580,174    
Net Sales 242,391 247,200 739,391 723,579    
Segment profit 80,195 64,387 195,085 207,723    
Goodwill 27,316   27,316     25,224
Western European Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 201,837 198,520 618,915 590,019    
Revenue Transactions With Other Operating Segments 43,605 47,879 133,513 140,521    
Net Sales 245,442 246,399 752,428 730,540    
Segment profit 43,960 46,345 139,395 129,615    
Goodwill 104,334   104,334     96,966
Chinese Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 164,400 162,012 471,982 569,449    
Revenue Transactions With Other Operating Segments 78,069 70,392 240,604 198,123    
Net Sales 242,469 232,404 712,586 767,572    
Segment profit 89,435 83,865 264,755 284,828    
Goodwill 629   629     596
Other Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 183,821 177,939 519,087 500,170    
Revenue Transactions With Other Operating Segments 5,786 2,677 16,722 17,236    
Net Sales 189,607 180,616 535,809 517,406    
Segment profit 31,455 30,007 81,264 78,690    
Goodwill 13,788   13,788     13,393
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 (353,827) (352,168) (1,083,206) (1,037,297)    
Net Sales (353,827) (352,168) (1,083,206) (1,037,297)    
Segment profit (45,749) (19,243) (123,657) (107,341)    
Goodwill 0   0     0
US Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 351,042 353,758 1,059,380 1,050,274    
Revenue Transactions With Other Operating Segments 37,411 34,253 110,846 101,243    
Net Sales 388,453 388,011 1,170,226 1,151,517    
Segment profit 97,277 $ 90,604 291,160 $ 276,605    
Goodwill $ 526,337   $ 526,337     $ 524,459