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Fair Value Measurements (Company's Portfolio of Other Investments Measured Using Net Asset Valuations) (Details)
$ in Thousands
Mar. 31, 2020
USD ($)
Senior secured bank loan funds  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Fair Value $ 22,600
Fair Value Measured at Net Asset Value Per Share  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Fair Value 199,563
Unfunded Commitments 424,534
Fair Value Measured at Net Asset Value Per Share | Private equity investments  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Fair Value 167,657
Unfunded Commitments 417,393
Fair Value Measured at Net Asset Value Per Share | Senior secured bank loan funds  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Fair Value 22,579
Unfunded Commitments 7,141
Fair Value Measured at Net Asset Value Per Share | Hedge funds  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]  
Fair Value 9,327
Unfunded Commitments $ 0