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3. Intangible Assets, Goodwill and Other (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Goodwill [Line Items]    
Goodwill $ 680,900 $ 682,500
Accumulated impairment loss (335,200) (335,200)
Goodwill, net 345,728 347,343
Goodwill, Other Increase (Decrease) (1,600)  
Clinical Diagnostics [Member]    
Goodwill [Line Items]    
Goodwill 349,200 349,200
Accumulated impairment loss (293,400) (293,400)
Goodwill, net 55,800 55,800
Goodwill, Other Increase (Decrease) 0  
Life Science [Member]    
Goodwill [Line Items]    
Goodwill 331,700 333,300
Accumulated impairment loss (41,800) (41,800)
Goodwill, net 289,900 $ 291,500
Goodwill, Other Increase (Decrease) $ (1,600)