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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
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Premiums Written    
Direct $ 320,657 $ 172,696
Assumed 3,670,027 2,617,565
Ceded (791,111) (526,558)
Net premiums written 3,199,573 2,263,703
Premiums Earned    
Direct 279,742 254,019
Assumed 2,597,198 1,843,669
Ceded (433,030) (417,138)
Net premiums earned 2,443,910 1,680,550
Claims and Claim Expenses    
Gross claims and claim expenses incurred 1,159,623 959,704
Claims and claim expenses recovered 6,500 (158,504)
Net claims and claim expenses incurred $ 1,166,123 $ 801,200