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2. Acquisitions (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 01, 2020
Oct. 01, 2019
Aug. 02, 2019
Mar. 04, 2019
Business Acquisition [Line Items]                        
Business Combination, Consideration Transferred $ 99,300 $ 4,200 $ 60,000 $ 20,000                
Payments to Acquire Businesses, Net of Cash Acquired   3,600 59,700 16,000 $ 4,000              
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 $ 26,800 $ 5,500
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets                 8,400 200    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities                 19,700      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets                       $ 200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net                 300 $ 1,400 $ 4,200  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets                 69,500      
Goodwill   264,131     $ 219,800 $ 291,916 $ 264,131 $ 219,800        
Goodwill, Acquired During Period 29,800   $ 28,700 15,600   29,800 44,300          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net                 99,300      
Business Combination, Consideration Transferred, Liabilities Incurred   $ 800   $ 1,300                
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High                 60,000      
Payments to Acquire Businesses, Gross 99,200                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents                 600      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill                 79,900      
Amortization expense           27,500 23,500 28,300        
Goodwill, Other Increase (Decrease)           2,000 0          
Proceeds from Divestiture of a Division 12,200         12,240 0 6,964        
Gain on divestiture of a division 11,700         (11,700) $ 0 $ (5,100)        
Developed Technology Rights [Member]                        
Business Acquisition [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                        
Business Acquisition [Line Items]                        
Finite-lived Intangible Assets Acquired $ 3,600                      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 4 years                      
Noncompete Agreements [Member]                        
Business Acquisition [Line Items]                        
Finite-lived Intangible Assets Acquired $ 1,400                      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years                      
In Process Research and Development [Member]                        
Business Acquisition [Line Items]                        
Finite-lived Intangible Assets Acquired $ 4,600                      
Analytical Flow Cytometer Platform [Member]                        
Business Acquisition [Line Items]                        
Business Combination, Contingent Consideration, Liability           0            
Celsee [Member]                        
Business Acquisition [Line Items]                        
Business Combination, Contingent Consideration, Liability           100     $ 100      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High           60,000            
Celsee [Member] | Cost of Sales [Member]                        
Business Acquisition [Line Items]                        
Amortization expense           2,800            
Celsee [Member] | Customer Lists | Selling, General and Administrative Expenses [Member]                        
Business Acquisition [Line Items]                        
Amortization expense           700            
Celsee [Member] | Noncompete Agreements [Member] | Selling, General and Administrative Expenses [Member]                        
Business Acquisition [Line Items]                        
Amortization expense           $ 400