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Investment Information - Other investments (Details) - Fair value option - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Schedule Of Other Investments [Line Items]    
Other investments $ 2,091,417 $ 2,429,316
Term loan investments    
Schedule Of Other Investments [Line Items]    
Other investments 1,135,584 1,326,018
Lending    
Schedule Of Other Investments [Line Items]    
Other investments 544,308 602,841
Credit related funds    
Schedule Of Other Investments [Line Items]    
Other investments 111,874 123,020
Energy    
Schedule Of Other Investments [Line Items]    
Other investments 63,057 97,402
Investment grade fixed income    
Schedule Of Other Investments [Line Items]    
Other investments 137,370 151,594
Infrastructure    
Schedule Of Other Investments [Line Items]    
Other investments 33,644 61,786
Private equity    
Schedule Of Other Investments [Line Items]    
Other investments 51,284 49,376
Real estate    
Schedule Of Other Investments [Line Items]    
Other investments $ 14,296 $ 17,279