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SCHEDULE IV - SUPPLEMENTARY REINSURANCE INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Supplementary Insurance Information [Line Items] |  |  |
GROSS AMOUNT | $ 6,034,355 | $ 5,535,889 | $ 5,102,958
CEDED TO OTHER COMPANIES | 3,248,537 | 3,254,200 | 2,951,539
ASSUMED FROM OTHER COMPANIES | 2,971,533 | 2,820,636 | 3,111,637
NET AMOUNT | $ 5,757,351 | $ 5,102,325 | $ 5,263,056
PERCENTAGE OF AMOUNT ASSUMED TO NET | 51.60% | 55.30% | 59.10%
Property and Casualty |  |  |
Supplementary Insurance Information [Line Items] |  |  |
GROSS AMOUNT | $ 5,596,538 | $ 5,223,919 | $ 4,858,629
CEDED TO OTHER COMPANIES | 3,085,338 | 3,161,438 | 2,900,300
ASSUMED FROM OTHER COMPANIES | 2,522,244 | 2,402,378 | 2,685,677
NET AMOUNT | $ 5,033,444 | $ 4,464,859 | $ 4,644,006
PERCENTAGE OF AMOUNT ASSUMED TO NET | 50.10% | 53.80% | 57.80%
Accident and health |  |  |
Supplementary Insurance Information [Line Items] |  |  |
GROSS AMOUNT | $ 437,817 | $ 311,970 | $ 244,329
CEDED TO OTHER COMPANIES | 163,199 | 92,762 | 51,239
ASSUMED FROM OTHER COMPANIES | 449,289 | 418,258 | 425,960
NET AMOUNT | $ 723,907 | $ 637,466 | $ 619,050
PERCENTAGE OF AMOUNT ASSUMED TO NET | 62.10% | 65.60% | 68.80%

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