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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Premiums Written      
Direct $ 994,286 $ 612,172 $ 461,409
Assumed 6,839,512 5,193,993 4,346,341
Ceded (1,894,423) (1,709,832) (1,426,257)
Net premiums written 5,939,375 4,096,333 3,381,493
Premiums Earned      
Direct 799,717 536,595 404,525
Assumed 6,257,814 5,078,682 4,348,261
Ceded (1,863,350) (1,662,815) (1,414,383)
Net premiums earned (Note 7) 5,194,181 3,952,462 3,338,403
Claims and Claim Expenses      
Gross claims and claim expenses incurred 5,905,616 3,893,204 3,221,778
Claims and claim expenses recovered (2,029,529) (968,595) (1,124,757)
Net claims and claim expenses incurred $ 3,876,087 $ 2,924,609 $ 2,097,021