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Fair Value Measurements (Unconsolidated Investments Holding a Variable Interest) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Maximum loss exposure | $ 1,822,317 | $ 899,177
Carrying amount |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Maximum loss exposure | 539,866 | 240,058
Unfunded Commitments |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Maximum loss exposure | $ 1,282,451 | $ 659,119

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