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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Sep. 30, 2022
Operations of the Company's operating segments            
Net Sales to External Customers $ 946,750 $ 982,117 $ 1,872,699 $ 1,910,855    
Revenue Transactions With Other Operating Segments 0 0 0 0    
Net Sales 946,750 982,117 1,872,699 1,910,855    
Segment Profit 284,101 307,704 551,429 574,155    
Goodwill 665,359   665,359   $ 670,108 $ 665,100
Swiss Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 50,185 46,803 104,435 93,172    
Revenue Transactions With Other Operating Segments 169,194 181,073 392,565 383,207    
Net Sales 219,379 227,876 497,000 476,379    
Segment profit 55,804 66,914 114,890 143,336    
Goodwill 25,841   25,841     25,865
Western European Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 202,313 192,075 417,078 391,499    
Revenue Transactions With Other Operating Segments 42,171 47,766 89,909 92,642    
Net Sales 244,484 239,841 506,987 484,141    
Segment profit 45,124 38,747 95,435 83,270    
Goodwill 99,401   99,401     100,452
Chinese Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 164,384 221,669 307,582 407,437    
Revenue Transactions With Other Operating Segments 81,894 67,279 162,536 127,731    
Net Sales 246,278 288,948 470,118 535,168    
Segment profit 99,496 119,722 175,319 200,963    
Goodwill 601   601     603
Other Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 167,653 162,455 335,266 322,231    
Revenue Transactions With Other Operating Segments 7,604 13,601 10,936 14,559    
Net Sales 175,257 176,056 346,202 336,790    
Segment profit 24,628 24,440 49,810 48,683    
Goodwill 13,131   13,131     13,721
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 (336,880) (343,460) (729,381) (685,128)    
Net Sales (336,880) (343,460) (729,381) (685,128)    
Segment profit (41,198) (46,325) (77,908) (88,097)    
Goodwill 0   0     0
US Operations [Member]            
Operations of the Company's operating segments            
Net Sales to External Customers 362,215 359,115 708,338 696,516    
Revenue Transactions With Other Operating Segments 36,017 33,741 73,435 66,989    
Net Sales 398,232 392,856 781,773 763,505    
Segment profit 100,247 $ 104,206 193,883 $ 186,000    
Goodwill $ 526,385   $ 526,385     $ 524,459