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REINSURANCE - Effect of Reinsurance and Retrocessional Activity on Premiums Written and Earned and on Net Claims and Claim Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Premiums Written        
Direct $ 295,213 $ 255,148 $ 935,079 $ 739,999
Assumed 1,925,448 1,519,032 6,693,185 5,780,781
Ceded (398,950) (287,740) (1,777,720) (1,697,965)
Net premiums written 1,821,711 1,486,440 5,850,544 4,822,815
Premiums Earned        
Direct 280,389 216,658 801,759 567,161
Assumed 2,006,596 1,798,229 5,307,078 4,669,877
Ceded (519,964) (508,622) (1,399,008) (1,384,147)
Net premiums earned 1,767,021 1,506,265 4,709,829 3,852,891
Claims and Claim Expenses        
Gross claims and claim expenses incurred 3,096,540 3,063,826 4,913,313 4,980,178
Claims and claim expenses recovered (1,128,609) (1,265,781) (1,397,410) (1,795,061)
Net claims and claim expenses incurred $ 1,967,931 $ 1,798,045 $ 3,515,903 $ 3,185,117