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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Premiums written        
Direct $ 99,538 $ 90,573 $ 210,506 $ 175,740
Assumed 1,377,370 886,770 2,830,697 1,961,255
Ceded (453,943) (372,834) (1,089,207) (869,442)
Net premiums written 1,022,965 604,509 1,951,996 1,267,553
Premiums earned        
Direct 90,638 69,904 180,452 139,936
Assumed 1,202,144 601,735 1,967,577 1,207,218
Ceded (381,280) (242,255) (686,499) (477,487)
Net premiums earned 911,502 429,385 1,461,530 869,667
Claims and claim expenses        
Gross claims and claim expenses incurred 752,056 76,945 1,090,175 302,687
Claims and claim expenses recovered (298,683) (16,778) (409,767) (70,817)
Net claims and claim expenses incurred $ 453,373 $ 60,167 $ 680,408 $ 231,870