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SCHEDULE IV - SUPPLEMENTARY REINSURANCE INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Supplementary Insurance Information [Line Items]      
GROSS AMOUNT $ 5,535,889 $ 5,102,958 $ 4,405,452
CEDED TO OTHER COMPANIES 3,254,200 2,951,539 2,759,360
ASSUMED FROM OTHER COMPANIES 2,820,636 3,111,637 3,280,532
NET AMOUNT $ 5,102,325 $ 5,263,056 $ 4,926,624
PERCENTAGE OF AMOUNT ASSUMED TO NET 55.30% 59.10% 66.60%
Property and Casualty      
Supplementary Insurance Information [Line Items]      
GROSS AMOUNT $ 5,223,919 $ 4,858,629 $ 4,233,758
CEDED TO OTHER COMPANIES 3,161,438 2,900,300 2,700,693
ASSUMED FROM OTHER COMPANIES 2,402,378 2,685,677 2,874,687
NET AMOUNT $ 4,464,859 $ 4,644,006 $ 4,407,752
PERCENTAGE OF AMOUNT ASSUMED TO NET 53.80% 57.80% 65.20%
Accident and health      
Supplementary Insurance Information [Line Items]      
GROSS AMOUNT $ 311,970 $ 244,329 $ 171,694
CEDED TO OTHER COMPANIES 92,762 51,239 58,667
ASSUMED FROM OTHER COMPANIES 418,258 425,960 405,845
NET AMOUNT $ 637,466 $ 619,050 $ 518,872
PERCENTAGE OF AMOUNT ASSUMED TO NET 65.60% 68.80% 78.20%