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Investment Information - Other Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Other Investments [Line Items]    
Other investments and fair value option investments $ 2,331,885 $ 2,429,316
Fair value option | Term loan investments    
Schedule Of Other Investments [Line Items]    
Other investments and fair value option investments 1,231,731 1,326,018
Fair value option | Lending    
Schedule Of Other Investments [Line Items]    
Other investments and fair value option investments 572,636 602,841
Fair value option | Credit related funds    
Schedule Of Other Investments [Line Items]    
Other investments and fair value option investments 90,780 123,020
Fair value option | Energy    
Schedule Of Other Investments [Line Items]    
Other investments and fair value option investments 65,813 97,402
Fair value option | Investment grade fixed income    
Schedule Of Other Investments [Line Items]    
Other investments and fair value option investments 138,646 151,594
Fair value option | Infrastructure    
Schedule Of Other Investments [Line Items]    
Other investments and fair value option investments 165,516 61,786
Fair value option | Private equity    
Schedule Of Other Investments [Line Items]    
Other investments and fair value option investments 48,750 49,376
Fair value option | Real estate    
Schedule Of Other Investments [Line Items]    
Other investments and fair value option investments $ 18,013 $ 17,279