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4. Goodwill and other Purchased Intangible Assets Intangible Assets, Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 $ 608,100 $ 525,600        
Future Amortization Expense, Year One 28,300          
Future Amortization Expense, Year Two 25,100          
Future Amortization Expense, Year Three 23,800          
Future Amortization Expense, Year Four 20,700          
Future Amortization Expense, Year Five 18,700          
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 78,100          
Finite-Lived Intangible Assets, Net [Abstract]            
Accumulated Amortization (413,400) (380,300)        
Net Carrying Amount 194,700 145,300        
Amortization [Abstract]            
Amortization expense 27,500 23,500 $ 28,300      
Impairment losses on goodwill and long-lived assets 0 0 292,513      
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) 0 0 $ 10,500      
Intangible Assets, Net (Excluding Goodwill) 199,497 145,525        
Intangible Assets, Gross (Excluding Goodwill) $ 612,900 $ 525,800        
Customer Relationships [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period 5 years 6 months 3 days 6 years 4 months 9 days        
Finite-Lived Intangible Assets, Gross $ 116,600 $ 107,200        
Finite-Lived Intangible Assets, Net [Abstract]            
Accumulated Amortization (87,200) (74,300)        
Net Carrying Amount $ 29,400 $ 32,900        
Know how [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period 4 years 9 months 5 years 8 months 15 days        
Finite-Lived Intangible Assets, Gross $ 196,600 $ 188,500        
Finite-Lived Intangible Assets, Net [Abstract]            
Accumulated Amortization (175,400) (162,600)        
Net Carrying Amount $ 21,200 $ 25,900        
Developed Technology Rights [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period 14 years 8 years 3 months 21 days        
Finite-Lived Intangible Assets, Gross $ 218,100 $ 144,200        
Finite-Lived Intangible Assets, Net [Abstract]            
Accumulated Amortization (107,100) (93,900)        
Net Carrying Amount $ 111,000 $ 50,300        
Licensing Agreements [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period 7 years 8 months 23 days 8 years 8 months 26 days        
Finite-Lived Intangible Assets, Gross $ 65,600 $ 76,000        
Finite-Lived Intangible Assets, Net [Abstract]            
Accumulated Amortization (37,400) (44,400)        
Net Carrying Amount $ 28,200 $ 31,600        
Trade Names [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period 7 years 9 months 25 days 8 years 6 months        
Finite-Lived Intangible Assets, Gross $ 6,600 $ 6,400        
Finite-Lived Intangible Assets, Net [Abstract]            
Accumulated Amortization (4,200) (3,600)        
Net Carrying Amount $ 2,400 $ 2,800        
Noncompete Agreements [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period 3 years 10 months 13 days 6 years 3 days        
Finite-Lived Intangible Assets, Gross $ 4,500 $ 3,200        
Finite-Lived Intangible Assets, Net [Abstract]            
Accumulated Amortization (2,000) (1,400)        
Net Carrying Amount $ 2,500 $ 1,800        
Other Intangible Assets [Member]            
Acquired Finite-Lived Intangible Assets [Line Items]            
Finite-Lived Intangible Assets, Remaining Amortization Period        
Finite-Lived Intangible Assets, Gross $ 100 $ 100        
Finite-Lived Intangible Assets, Net [Abstract]            
Accumulated Amortization (100) (100)        
Net Carrying Amount 0 0        
In Process Research and Development [Member]            
Amortization [Abstract]            
Indefinite-lived Intangible Assets (Excluding Goodwill) $ 4,800 $ 200