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SCHEDULE IV - SUPPLEMENTARY REINSURANCE INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
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%