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2. Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Apr. 01, 2020
Oct. 01, 2019
Business Combinations [Abstract]              
Business Combination, Consideration Transferred $ 99,500 $ 4,200          
Payments to Acquire Businesses, Net of Cash Acquired   3,600          
Business Combination, Contingent Consideration, Liability           $ (100) $ (600)
Business Combination, Separately Recognized Transactions, Revenues and Gains Recognized   $ 400          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles             3,400
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets           8,700 200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net           300 1,400
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High           60,000  
Payments to Acquire Businesses, Gross 99,400            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents           600  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities           (19,400) $ (800)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill           79,900  
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net           99,500  
Business Combination, Goodwill [Abstract]              
Goodwill, Acquired During Period 29,400     $ 29,400      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets           $ 70,100  
Proceeds from Divestiture of Businesses 12,200     12,240 $ 0    
Gain (Loss) on Disposition of Business 11,700   $ 0 11,700 0    
Amortization expense 7,200   5,600 13,100 11,100    
Acquired Finite-Lived Intangible Assets [Line Items]              
Amortization expense 7,200   $ 5,600 $ 13,100 $ 11,100    
Celsee, Inc. [Member] | Cost of Sales [Member]              
Business Combination, Goodwill [Abstract]              
Amortization expense 900            
Acquired Finite-Lived Intangible Assets [Line Items]              
Amortization expense 900            
In Process Research and Development [Member]              
Business Combination, Goodwill [Abstract]              
Indefinite-lived Intangible Assets Acquired 4,600            
Acquired Indefinite-lived Intangible Assets [Line Items]              
Indefinite-lived Intangible Assets Acquired 4,600            
Developed Technology Rights [Member]              
Business Combination, Goodwill [Abstract]              
Finite-lived Intangible Assets Acquired $ 70,300            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 18 years 10 months 24 days            
Acquired Finite-Lived Intangible Assets [Line Items]              
Finite-lived Intangible Assets Acquired $ 70,300            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 18 years 10 months 24 days            
Customer Lists [Member]              
Business Combination, Goodwill [Abstract]              
Finite-lived Intangible Assets Acquired $ 3,600            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years            
Acquired Finite-Lived Intangible Assets [Line Items]              
Finite-lived Intangible Assets Acquired $ 3,600            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years            
Customer Lists [Member] | Celsee, Inc. [Member] | Selling, General and Administrative Expenses [Member]              
Business Combination, Goodwill [Abstract]              
Amortization expense $ 200            
Acquired Finite-Lived Intangible Assets [Line Items]              
Amortization expense 200            
Noncompete Agreements [Member]              
Business Combination, Goodwill [Abstract]              
Finite-lived Intangible Assets Acquired $ 1,400            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years            
Acquired Finite-Lived Intangible Assets [Line Items]              
Finite-lived Intangible Assets Acquired $ 1,400            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years            
Noncompete Agreements [Member] | Celsee, Inc. [Member] | Selling, General and Administrative Expenses [Member]              
Business Combination, Goodwill [Abstract]              
Amortization expense $ 100            
Acquired Finite-Lived Intangible Assets [Line Items]              
Amortization expense $ 100