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2. Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Oct. 01, 2019
Aug. 02, 2019
Mar. 04, 2019
Dec. 31, 2017
Business Acquisition [Line Items]                    
Business Combination, Consideration Transferred $ 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             $ 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 200       $ 200          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets                 $ 200  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net             $ 1,400 $ 4,200    
Goodwill 264,131     $ 219,770 264,131 $ 219,770       $ 506,100
Goodwill, Acquired During Period   $ 28,700 15,600   44,300 $ 0        
Business Combination, Consideration Transferred, Liabilities Incurred 800   $ 1,300              
Analytical Flow Cytometer Platform [Member]                    
Business Acquisition [Line Items]                    
Business Combination, Contingent Consideration, Liability $ 4,300       $ 4,300