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Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Business Acquisition [Line Items]      
Goodwill   $ 239,724 $ 235,426
Midwest U.S.-based multi-site reference laboratory      
Business Acquisition [Line Items]      
Consideration transferred   $ 50,000  
Intangible assets acquired $ 26,900    
Tangible assets acquired 200    
Goodwill $ 22,900    
Customer Relationships | Midwest U.S.-based multi-site reference laboratory      
Business Acquisition [Line Items]      
Weighted average useful life of finite-lived intangible assets (in years) 13 years 9 months 18 days