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4. Goodwill and other Purchased Intangible Assets Intangible Assets, Goodwill and Other (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 01, 2020
Goodwill [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             $ 79,900
Goodwill [Roll Forward]              
Goodwill period start     $ 555,000 $ 599,300 $ 555,000    
Accumulated impairment loss period start     (335,200) (335,200) (335,200)    
Goodwill, net period start     219,800 264,131 219,800    
Goodwill, Acquired During Period $ 29,800 $ 28,700 15,600 29,800 44,300    
Goodwill, Other Increase (Decrease)       (2,000) 0    
Goodwill, Impairment Loss       0 0 $ 282,000  
Goodwill, Period Increase (Decrease)       27,800 44,300    
Goodwill period end       627,100 599,300 555,000  
Accumulated impairment loss period end       (335,200) (335,200) (335,200)  
Goodwill, net period end       291,916 264,131 219,800  
Life Science [Member]              
Goodwill [Roll Forward]              
Goodwill period start     234,500 250,100 234,500    
Accumulated impairment loss period start     (41,800) (41,800) (41,800)    
Goodwill, net period start     192,700 208,300 192,700    
Goodwill, Acquired During Period       29,800 15,600    
Goodwill, Other Increase (Decrease)       (2,000) 0    
Goodwill, Impairment Loss           5,900  
Goodwill, Period Increase (Decrease)       27,800 15,600    
Goodwill period end       277,900 250,100 234,500  
Accumulated impairment loss period end       (41,800) (41,800) (41,800)  
Goodwill, net period end       236,100 208,300 192,700  
Clinical Diagnostics [Member]              
Goodwill [Roll Forward]              
Goodwill period start     320,500 349,200 320,500    
Accumulated impairment loss period start     (293,400) (293,400) (293,400)    
Goodwill, net period start     $ 27,100 55,800 27,100    
Goodwill, Acquired During Period       0 28,700    
Goodwill, Other Increase (Decrease)       0 0    
Goodwill, Impairment Loss           276,100  
Goodwill, Period Increase (Decrease)       0 28,700    
Goodwill period end       349,200 349,200 320,500  
Accumulated impairment loss period end       (293,400) (293,400) (293,400)  
Goodwill, net period end       $ 55,800 $ 55,800 $ 27,100