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Investment Information - Equity method investments (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Schedule of Equity Method Investments [Line Items] |  |
Investments accounted for using the equity method | $ 3,325,543 | $ 3,077,611
Credit related funds |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments accounted for using the equity method | 1,067,549 | 1,022,334
Private equity |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments accounted for using the equity method | 602,802 | 436,042
Real estate |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments accounted for using the equity method | 444,755 | 396,395
Lending |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments accounted for using the equity method | 409,736 | 376,649
Equity securities |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments accounted for using the equity method | 360,906 | 395,090
Infrastructure |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments accounted for using the equity method | 226,430 | 230,070
Energy |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments accounted for using the equity method | 107,842 | 119,141
Fixed income |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments accounted for using the equity method | $ 105,523 | $ 101,890

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