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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
Segment Reporting Information [Line Items]        
Net sales $ 747,049 $ 647,263 $ 2,189,776 $ 1,755,787
Life Science [Member]        
Segment Reporting Information [Line Items]        
Net sales 373,500 324,000 1,074,200 803,200
Income before income taxes 105,800 75,700 272,700 134,900
Clinical Diagnostics [Member]        
Segment Reporting Information [Line Items]        
Net sales 372,200 322,200 1,111,000 945,600
Income before income taxes 50,700 28,800 108,900 83,100
Other Segments [Member]        
Segment Reporting Information [Line Items]        
Net sales 1,300 1,100 4,600 7,000
Income before income taxes $ (200) $ (600) $ (400) $ 600