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Acquisitions and Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2020
Mar. 31, 2020
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]            
Goodwill $ 243,347     $ 239,724 $ 214,489 $ 199,873
Reference laboratory in Mid-West, U.S.            
Business Acquisition [Line Items]            
Purchase price of acquired assets $ 50,000          
Net tangible liabilities   $ 200        
Goodwill   22,900        
Software company            
Business Acquisition [Line Items]            
Purchase price of acquired assets     $ 25,000      
Net tangible liabilities     300      
Goodwill     20,300      
Customer relationships | Reference laboratory in Mid-West, U.S.            
Business Acquisition [Line Items]            
Intangible assets   $ 26,900        
Intangible assets useful life   13 years 9 months 18 days        
Customer relationships | Software company            
Business Acquisition [Line Items]            
Intangible assets     2,400      
Technology-based intangible assets | Software company            
Business Acquisition [Line Items]            
Intangible assets     $ 2,600