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Investment Information - Other investments (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Other investments | $ 1,644,197 | $ 1,973,550
Fixed maturities |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Other investments | 554,120 | 416,698
Other investments |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Other investments | 1,043,184 | 1,432,553
Short-term investments |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Other investments | 33,101 | 97,806
Equity securities |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Other investments | $ 13,792 | $ 26,493

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