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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Premiums written        
Direct $ 177,562 $ 99,538 $ 325,254 $ 210,506
Assumed 1,524,310 1,377,370 3,402,339 2,830,697
Ceded (521,069) (453,943) (1,276,982) (1,089,207)
Net premiums written 1,180,803 1,022,965 2,450,611 1,951,996
Premiums earned        
Direct 138,327 90,638 272,556 180,452
Assumed 1,281,357 1,202,144 2,431,090 1,967,577
Ceded (409,588) (381,280) (780,452) (686,499)
Net premiums earned 1,010,096 911,502 1,923,194 1,461,530
Claims and claim expenses        
Gross claims and claim expenses incurred 647,226 752,056 1,394,941 1,090,175
Claims and claim expenses recovered (136,954) (298,683) (313,715) (409,767)
Net claims and claim expenses incurred $ 510,272 $ 453,373 $ 1,081,226 $ 680,408