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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Premiums written        
Direct $ 74,635 $ 64,040 $ 250,375 $ 205,253
Assumed 551,042 576,229 2,512,297 2,184,521
Ceded (172,422) (157,048) (1,041,864) (806,672)
Net premiums written 453,255 483,221 1,720,808 1,583,102
Premiums earned        
Direct 73,356 61,908 213,292 176,433
Assumed 760,920 712,499 1,968,138 1,731,845
Ceded (302,427) (226,615) (779,914) (612,176)
Net premiums earned 531,849 547,792 1,401,516 1,296,102
Claims and claim expenses        
Gross claims and claim expenses incurred 514,873 2,482,510 817,560 2,924,217
Claims and claim expenses recovered (104,363) (1,260,814) (175,180) (1,366,853)
Net claims and claim expenses incurred $ 410,510 $ 1,221,696 $ 642,380 $ 1,557,364