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Schedule IV. Supplemental Schedule of Reinsurance Premiums (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract] |  |  |
Gross Amounts | $ 1,013,372 | $ 1,105,164 | $ 799,717
Ceded to Other Companies | 1,614,432 | 1,850,807 | 1,863,350
Assumed | 8,072,193 | 7,079,632 | 6,257,814
Net premiums earned (Note 7) | $ 7,471,133 | $ 6,333,989 | $ 5,194,181
Percentage of Amount Assumed to Net | 108.00% | 112.00% | 120.00%

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