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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
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Premiums Written      
Direct $ 865,771 $ 1,264,410 $ 994,286
Assumed 7,996,595 7,949,130 6,839,512
Ceded (1,394,553) (2,017,380) (1,894,423)
Net premiums written 7,467,813 7,196,160 5,939,375
Premiums Earned      
Direct 1,013,372 1,105,164 799,717
Assumed 8,072,193 7,079,632 6,257,814
Ceded (1,614,432) (1,850,807) (1,863,350)
Net premiums earned (Note 7) 7,471,133 6,333,989 5,194,181
Claims and Claim Expenses      
Gross claims and claim expenses incurred 3,950,362 5,851,140 5,905,616
Claims and claim expenses recovered (376,853) (1,512,300) (2,029,529)
Net claims and claim expenses incurred $ 3,573,509 $ 4,338,840 $ 3,876,087