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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Premiums Written        
Direct $ 288,892 $ 222,400 $ 908,336 $ 673,791
Assumed 2,111,244 1,396,043 8,907,979 6,386,534
Ceded (237,632) (197,183) (1,615,727) (1,179,559)
Net premiums written 2,162,504 1,421,260 8,200,588 5,880,766
Premiums Earned        
Direct 273,619 248,932 812,942 784,388
Assumed 2,783,423 1,862,387 8,098,231 5,609,355
Ceded (474,073) (355,443) (1,342,979) (1,172,055)
Net premiums earned 2,582,969 1,755,876 7,568,194 5,221,688
Claims and Claim Expenses        
Gross claims and claim expenses incurred 1,450,118 793,869 4,069,252 2,843,229
Claims and claim expenses recovered (76,504) 67,707 (220,013) (249,242)
Net claims and claim expenses incurred $ 1,373,614 $ 861,576 $ 3,849,239 $ 2,593,987