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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Premiums Written        
Direct $ 216,934 $ 288,892 $ 691,354 $ 908,336
Assumed 2,106,692 2,111,244 9,208,955 8,907,979
Ceded (265,824) (237,632) (1,628,708) (1,615,727)
Net premiums written 2,057,802 2,162,504 8,271,601 8,200,588
Premiums Earned        
Direct 223,861 273,619 722,754 812,942
Assumed 2,674,658 2,783,423 8,144,270 8,098,231
Ceded (464,714) (474,073) (1,300,284) (1,342,979)
Net premiums earned (Note 5) 2,433,805 2,582,969 7,566,740 7,568,194
Claims and Claim Expenses        
Gross claims and claim expenses incurred 942,559 1,450,118 5,114,509 4,069,252
Claims and claim expenses recovered (63,739) (76,504) (449,808) (220,013)
Net claims and claim expenses incurred $ 878,820 $ 1,373,614 $ 4,664,701 $ 3,849,239