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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Premiums written        
Direct $ 259,712 $ 177,562 $ 484,851 $ 325,254
Assumed 1,834,446 1,524,310 4,261,749 3,402,339
Ceded (581,866) (521,069) (1,410,225) (1,276,982)
Net premiums written 1,512,292 1,180,803 3,336,375 2,450,611
Premiums earned        
Direct 188,414 138,327 350,503 272,556
Assumed 1,455,002 1,281,357 2,871,648 2,431,090
Ceded (450,626) (409,588) (875,525) (780,452)
Net premiums earned 1,192,790 1,010,096 2,346,626 1,923,194
Claims and claim expenses        
Gross claims and claim expenses incurred 666,106 647,226 1,916,352 1,394,941
Claims and claim expenses recovered (146,085) (136,954) (529,280) (313,715)
Net claims and claim expenses incurred $ 520,021 $ 510,272 $ 1,387,072 $ 1,081,226