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REINSURANCE - Schedule of Effect of Reinsurance and Retrocessional Activity on Premiums Written and Earned and on Net Claims and Claim Expenses Incurred (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Premiums Written      
Direct $ 1,197,360 $ 865,771 $ 1,264,410
Assumed 10,535,706 7,996,595 7,949,130
Ceded (1,780,850) (1,394,553) (2,017,380)
Net premiums written 9,952,216 7,467,813 7,196,160
Premiums Earned      
Direct 1,097,726 1,013,372 1,105,164
Assumed 10,815,336 8,072,193 7,079,632
Ceded (1,817,302) (1,614,432) (1,850,807)
Net premiums earned (Note 7) 10,095,760 7,471,133 6,333,989
Claims and Claim Expenses      
Gross claims and claim expenses incurred 5,629,756 3,950,362 5,851,140
Claims and claim expenses recovered (296,775) (376,853) (1,512,300)
Net claims and claim expenses incurred $ 5,332,981 $ 3,573,509 $ 4,338,840