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4. Goodwill and other Purchased Intangible Assets Intangible Assets, Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 01, 2019
Aug. 02, 2019
Mar. 04, 2019
Acquired Finite-Lived Intangible Assets [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles         $ 3,400 $ 26,800 $ 5,500
Finite-Lived Intangible Assets, Gross $ 493,100 $ 525,600 $ 493,100        
Future Amortization Expense, Year One   23,500          
Future Amortization Expense, Year Two   22,800          
Future Amortization Expense, Year Three   19,600          
Future Amortization Expense, Year Four   18,700          
Future Amortization Expense, Year Five   16,600          
Finite-Lived Intangible Assets, Amortization Expense, after Year Five   44,100          
Finite-Lived Intangible Assets, Net [Abstract]              
Accumulated Amortization (360,000) (380,300) (360,000)        
Net Carrying Amount 133,100 145,300 133,100        
Amortization [Abstract]              
Amortization expense   23,500 28,300 $ 30,800      
Impairment losses on goodwill and long-lived assets 292,500 0 292,513 $ 11,506      
Intangible Assets, Net (Excluding Goodwill) 133,123 145,525 $ 133,123        
Intangible Assets, Gross (Excluding Goodwill)   $ 525,800          
Customer Relationships [Member]              
Acquired Finite-Lived Intangible Assets [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles           16,100  
Finite-Lived Intangible Assets, Remaining Amortization Period   6 years 3 years        
Finite-Lived Intangible Assets, Gross 88,700 $ 107,200 $ 88,700        
Finite-Lived Intangible Assets, Net [Abstract]              
Accumulated Amortization (68,300) (74,300) (68,300)        
Net Carrying Amount 20,400 $ 32,900 $ 20,400        
Know how [Member]              
Acquired Finite-Lived Intangible Assets [Line Items]              
Finite-Lived Intangible Assets, Remaining Amortization Period   5 years 6 years        
Finite-Lived Intangible Assets, Gross 190,600 $ 188,500 $ 190,600        
Finite-Lived Intangible Assets, Net [Abstract]              
Accumulated Amortization (159,800) (162,600) (159,800)        
Net Carrying Amount 30,800 $ 25,900 $ 30,800        
Developed Technology Rights [Member]              
Acquired Finite-Lived Intangible Assets [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles           8,100  
Finite-Lived Intangible Assets, Remaining Amortization Period   8 years 8 years        
Finite-Lived Intangible Assets, Gross 130,400 $ 144,200 $ 130,400        
Finite-Lived Intangible Assets, Net [Abstract]              
Accumulated Amortization (86,600) (93,900) (86,600)        
Net Carrying Amount 43,800 $ 50,300 $ 43,800        
Licensing Agreements [Member]              
Acquired Finite-Lived Intangible Assets [Line Items]              
Finite-Lived Intangible Assets, Remaining Amortization Period   8 years 9 years        
Finite-Lived Intangible Assets, Gross 76,300 $ 76,000 $ 76,300        
Finite-Lived Intangible Assets, Net [Abstract]              
Accumulated Amortization (40,900) (44,400) (40,900)        
Net Carrying Amount 35,400 $ 31,600 $ 35,400        
Trade Names [Member]              
Acquired Finite-Lived Intangible Assets [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles           2,500  
Finite-Lived Intangible Assets, Remaining Amortization Period   8 years 3 years        
Finite-Lived Intangible Assets, Gross 3,900 $ 6,400 $ 3,900        
Finite-Lived Intangible Assets, Net [Abstract]              
Accumulated Amortization (3,300) (3,600) (3,300)        
Net Carrying Amount 600 $ 2,800 $ 600        
Noncompete Agreements [Member]              
Acquired Finite-Lived Intangible Assets [Line Items]              
Finite-Lived Intangible Assets, Remaining Amortization Period   6 years 7 years        
Finite-Lived Intangible Assets, Gross 3,200 $ 3,200 $ 3,200        
Finite-Lived Intangible Assets, Net [Abstract]              
Accumulated Amortization (1,100) (1,400) (1,100)        
Net Carrying Amount $ 2,100 $ 1,800 $ 2,100        
Other Intangible Assets [Member]              
Acquired Finite-Lived Intangible Assets [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles           $ 100  
Finite-Lived Intangible Assets, Remaining Amortization Period   0 years 0 years        
Finite-Lived Intangible Assets, Gross   $ 100          
Finite-Lived Intangible Assets, Net [Abstract]              
Accumulated Amortization   (100)          
Net Carrying Amount   0          
Life Science [Member] | CellSorter [Member] | Developed Technology Rights [Member]              
Amortization [Abstract]              
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     $ 8,800        
Life Science [Member] | CellSorter [Member] | Noncompete Agreements [Member]              
Amortization [Abstract]              
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     $ 1,700        
In Process Research and Development [Member]              
Amortization [Abstract]              
Indefinite-lived Intangible Assets (Excluding Goodwill)   $ 200