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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Premiums Written        
Direct $ 230,764 $ 298,787 $ 474,420 $ 619,444
Assumed 3,190,416 3,126,708 7,102,263 6,796,735
Ceded (650,910) (586,984) (1,362,884) (1,378,095)
Net premiums written 2,770,270 2,838,511 6,213,799 6,038,084
Premiums Earned        
Direct 246,999 259,581 498,893 539,323
Assumed 2,614,285 2,717,610 5,469,612 5,314,808
Ceded (449,130) (435,876) (835,570) (868,906)
Net premiums earned (Note 5) 2,412,154 2,541,315 5,132,935 4,985,225
Claims and Claim Expenses        
Gross claims and claim expenses incurred 1,067,108 1,459,511 4,171,950 2,619,134
Claims and claim expenses recovered (24,985) (150,009) (386,069) (143,509)
Net claims and claim expenses incurred $ 1,042,123 $ 1,309,502 $ 3,785,881 $ 2,475,625