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Subsequent Events (Details) - USD ($)
6 Months Ended
Jul. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Aug. 04, 2021
Jul. 01, 2021
Feb. 21, 2021
Jul. 31, 2018
Dec. 23, 2016
Subsequent Event [Line Items]                  
Principal repayment   $ 120,000,000.0   $ 0          
Revolving credit facility                  
Subsequent Event [Line Items]                  
Maximum aggregate principal commitment                 $ 300,000,000.0
Principal repayment   120,000,000.0 $ 0            
Revolving credit facility | Amended facility                  
Subsequent Event [Line Items]                  
Maximum aggregate principal commitment   $ 300,000,000.0 $ 350,000,000.0       $ 300,000,000.0 $ 350,000,000.0  
Subsequent event                  
Subsequent Event [Line Items]                  
Principal repayment $ 106,400,000                
Interest payment $ 400,000                
Subsequent event | Revolving credit facility | Amended facility                  
Subsequent Event [Line Items]                  
Maximum aggregate principal commitment         $ 0 $ 263,500,000      
Subsequent event | Myriad RBM, Inc. | Disposed of by sale                  
Subsequent Event [Line Items]                  
Cash consideration           198,000,000.0      
Aggregate adjustments for working capital, indebtedness, and transaction costs           $ 3,900,000