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Fair Value Measurements (Unconsolidated Investments Holding a Variable Interest) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Maximum loss exposure | $ 1,912,104 | $ 1,822,317
Carrying amount |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Maximum loss exposure | 596,925 | 539,866
Unfunded Commitments |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Maximum loss exposure | $ 1,315,179 | $ 1,282,451

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