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Reinsurance - Effect of Reinsurance and Retrocessional Activity on Premiums Written and Earned and on Net Claims and Claim Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Premiums Written |  |  |
Direct | $ 865,771 | $ 1,264,410 | $ 994,286
Assumed | 7,996,595 | 7,949,130 | 6,839,512
Ceded | (1,394,553) | (2,017,380) | (1,894,423)
Net premiums written | 7,467,813 | 7,196,160 | 5,939,375
Premiums Earned |  |  |
Direct | 1,013,372 | 1,105,164 | 799,717
Assumed | 8,072,193 | 7,079,632 | 6,257,814
Ceded | (1,614,432) | (1,850,807) | (1,863,350)
Net premiums earned (Note 7) | 7,471,133 | 6,333,989 | 5,194,181
Claims and Claim Expenses |  |  |
Gross claims and claim expenses incurred | 3,950,362 | 5,851,140 | 5,905,616
Claims and claim expenses recovered | (376,853) | (1,512,300) | (2,029,529)
Net claims and claim expenses incurred | $ 3,573,509 | $ 4,338,840 | $ 3,876,087

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