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4. Intangible Assets, Goodwill and Other (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Dec. 31, 2021
Goodwill [Line Items]      
Goodwill $ 734,800 $ 734,800 $ 682,500
Accumulated impairment loss (335,200) (335,200) (335,200)
Goodwill, net 399,589 399,589 347,343
Goodwill, Acquired During Period 55,900 55,900  
Goodwill, Foreign Currency Translation Gain (Loss)   (3,600)  
Goodwill, Period Increase (Decrease)   52,300  
Clinical Diagnostics [Member]      
Goodwill [Line Items]      
Goodwill 401,500 401,500 349,200
Accumulated impairment loss (293,400) (293,400) (293,400)
Goodwill, net 108,100 108,100 55,800
Goodwill, Acquired During Period   55,900  
Goodwill, Foreign Currency Translation Gain (Loss)   (3,600)  
Goodwill, Period Increase (Decrease)   52,300  
Life Science [Member]      
Goodwill [Line Items]      
Goodwill 333,300 333,300 333,300
Accumulated impairment loss (41,800) (41,800) (41,800)
Goodwill, net $ 291,500 291,500 $ 291,500
Goodwill, Acquired During Period   0  
Goodwill, Foreign Currency Translation Gain (Loss)   0  
Goodwill, Period Increase (Decrease)   $ 0