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Investment Information - Cash and restricted cash (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Disclosure Investment Information [Abstract] |  |  |  |
Cash | $ 812,917 | $ 858,668 |  |
Restricted cash (included in ‘other assets’) | 503,201 | 456,103 |  |
Cash and restricted cash | $ 1,316,118 | $ 1,314,771 | $ 1,367,514 | $ 1,290,544

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