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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Premiums written        
Direct $ 108,478 $ 74,635 $ 318,984 $ 250,375
Assumed 752,590 551,042 3,583,287 2,512,297
Ceded (156,938) (172,422) (1,246,145) (1,041,864)
Net premiums written 704,130 453,255 2,656,126 1,720,808
Premiums earned        
Direct 103,446 73,356 283,898 213,292
Assumed 1,146,831 760,920 3,114,408 1,968,138
Ceded (343,529) (302,427) (1,030,028) (779,914)
Net premiums earned 906,748 531,849 2,368,278 1,401,516
Claims and claim expenses        
Gross claims and claim expenses incurred 714,714 514,873 1,804,889 817,560
Claims and claim expenses recovered (60,194) (104,363) (469,961) (175,180)
Net claims and claim expenses incurred $ 654,520 $ 410,510 $ 1,334,928 $ 642,380