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Segment Reporting Segment (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
reportableSegment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Segment Reporting [Abstract]      
Number of reportable segments | reportableSegment 5    
Net sales to external customers $ 3,872,361 $ 3,788,309 $ 3,919,709
Net sales to other segments 0 0 0
Net Sales 3,872,361 3,788,309 3,919,709
Segment profit 1,199,923 1,151,896 1,192,459
Depreciation 50,352 48,951 46,784
Assets 3,239,999 3,355,555 3,492,395
Purchase of property, plant and equipment (103,898) (105,323) (121,241)
Goodwill 668,914 670,108 660,170
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]      
Net sales to external customers 0 0 0
Net sales to other segments (1,482,763) (1,385,896) (1,505,858)
Net Sales (1,482,763) (1,385,896) (1,505,858)
Unallocated expense / eliminations 150,073 146,642 164,023
Segment profit (150,073) (146,642) (164,023)
Depreciation 6,170 6,814 6,713
Assets (7,397,549) (6,978,811) (5,988,260)
Purchase of property, plant and equipment (45,474) (33,459) (34,291)
Goodwill 0 0 0
U.S. Operations Segment | Operating Segments [Member]      
Depreciation 16,970 15,863 14,582
Assets 4,081,688 3,848,003 3,574,842
Purchase of property, plant and equipment (16,542) (36,269) (55,464)
Goodwill 532,394 526,392 524,470
Swiss Operations Segment | Operating Segments [Member]      
Net sales to external customers 218,580 188,679 176,119
Net sales to other segments 801,749 761,114 839,951
Net Sales 1,020,329 949,793 1,016,070
Segment cost of sales 498,505 436,494 487,642
Segment period expense 241,178 231,818 218,584
Segment profit 280,646 281,481 309,844
Depreciation 7,086 7,017 6,644
Assets 3,780,506 3,554,911 2,968,539
Purchase of property, plant and equipment (9,504) (8,030) (7,690)
Goodwill 25,601 27,532 25,058
Western European Operations Segment | Operating Segments [Member]      
Net sales to external customers 858,002 792,907 799,931
Net sales to other segments 185,321 188,963 196,900
Net Sales 1,043,323 981,870 996,831
Segment cost of sales 486,823 455,596 488,153
Segment period expense 350,199 347,601 334,326
Segment profit 206,301 178,673 174,352
Depreciation 5,339 5,351 4,970
Assets 1,505,017 1,533,297 1,314,332
Purchase of property, plant and equipment (6,340) (5,052) (5,110)
Goodwill 97,426 101,653 96,077
Chinese Operations Segment | Operating Segments [Member]      
Net sales to external customers 628,447 718,818 841,526
Net sales to other segments 320,196 278,027 308,164
Net Sales 948,643 996,845 1,149,690
Segment cost of sales 422,130 448,341 530,270
Segment period expense 180,713 181,410 195,258
Segment profit 345,800 367,094 424,162
Depreciation 9,434 9,609 9,699
Assets 854,023 989,955 1,234,303
Purchase of property, plant and equipment (14,355) (10,133) (12,418)
Goodwill 597 621 641
Other Operations Segment | Operating Segments [Member]      
Net sales to external customers 737,830 683,986 657,673
Net sales to other segments 21,738 20,600 3,959
Net Sales 759,568 704,586 661,632
Segment cost of sales 421,489 400,634 380,360
Segment period expense 213,895 197,714 190,950
Segment profit 124,184 106,238 90,322
Depreciation 5,353 4,297 4,176
Assets 416,314 408,200 388,639
Purchase of property, plant and equipment (11,683) (12,380) (6,268)
Goodwill 12,896 13,910 13,924
Us Operations segment Member | Operating Segments [Member]      
Net sales to external customers 1,429,502 1,403,919 1,444,460
Net sales to other segments 153,759 137,192 156,884
Net Sales 1,583,261 1,541,111 1,601,344
Segment cost of sales 690,498 689,004 736,798
Segment period expense 499,698 487,055 506,744
Segment profit $ 393,065 $ 365,052 $ 357,802