Segment Reporting Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues	$ 3,788,309	$ 3,919,709	$ 3,717,930
Revenue Transactions With Other Operating Segments	0	0	0
Net Sales	3,788,309	3,919,709	3,717,930
Total Segment Profit	1,151,896	1,192,459	1,057,811
Depreciation	48,951	46,784	44,982
Assets	3,355,555	3,492,395	3,326,798
Purchase of property, plant and equipment	(105,323)	(121,241)	(107,580)
Goodwill	670,108	660,170	648,622
U.S. Operations Segment
Revenues	1,403,919	1,444,460	1,287,983
Revenue Transactions With Other Operating Segments	137,192	156,884	155,987
Net Sales	1,541,111	1,601,344	1,443,970
Segment Profit	365,052	357,802	302,177
Depreciation	15,863	14,582	12,123
Assets	3,848,003	3,574,842	3,278,400
Purchase of property, plant and equipment	(36,269)	(55,464)	(34,972)
Goodwill	526,392	524,470	508,942
Swiss Operations Segment
Revenues	188,679	176,119	171,633
Revenue Transactions With Other Operating Segments	761,114	839,951	826,001
Net Sales	949,793	1,016,070	997,634
Segment Profit	281,481	309,844	301,142
Depreciation	7,017	6,644	6,557
Assets	3,554,911	2,968,539	2,700,965
Purchase of property, plant and equipment	(8,030)	(7,690)	(7,856)
Goodwill	27,532	25,058	23,710
Western European Operations Segment
Revenues	792,907	799,931	829,761
Revenue Transactions With Other Operating Segments	188,963	196,900	211,547
Net Sales	981,870	996,831	1,041,308
Segment Profit	178,673	174,352	172,265
Depreciation	5,351	4,970	5,264
Assets	1,533,297	1,314,332	1,566,819
Purchase of property, plant and equipment	(5,052)	(5,110)	(11,014)
Goodwill	101,653	96,077	100,433
Chinese Operations Segment
Revenues	718,818	841,526	771,651
Revenue Transactions With Other Operating Segments	278,027	308,164	291,779
Net Sales	996,845	1,149,690	1,063,430
Segment Profit	367,094	424,162	369,835
Depreciation	9,609	9,699	9,566
Assets	989,955	1,234,303	1,037,838
Purchase of property, plant and equipment	(10,133)	(12,418)	(15,700)
Goodwill	621	641	710
Other Operations Segment
Revenues	683,986	657,673	656,902
Revenue Transactions With Other Operating Segments	20,600	3,959	4,780
Net Sales	704,586	661,632	661,682
Segment Profit	106,238	90,322	100,028
Depreciation	4,297	4,176	3,819
Assets	408,200	388,639	365,182
Purchase of property, plant and equipment	(12,380)	(6,268)	(5,652)
Goodwill	13,910	13,924	14,827
Eliminations and Corporate Segment
Revenues		0	0
Revenue Transactions With Other Operating Segments	(1,385,896)	(1,505,858)	(1,490,094)
Net Sales	(1,385,896)	(1,505,858)	(1,490,094)
Segment Profit	(146,642)	(164,023)	(187,636)
Depreciation	6,814	6,713	7,653
Assets	(6,978,811)	(5,988,260)	(5,622,406)
Purchase of property, plant and equipment	(33,459)	(34,291)	(32,386)
Goodwill	$ 0	$ 0	$ 0