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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Premiums written        
Direct $ 138,208 $ 108,478 $ 463,462 $ 318,984
Assumed 1,004,850 752,590 4,407,189 3,583,287
Ceded (243,647) (156,938) (1,520,629) (1,246,145)
Net premiums written 899,411 704,130 3,350,022 2,656,126
Premiums earned        
Direct 128,621 103,446 401,177 283,898
Assumed 1,301,871 1,146,831 3,732,961 3,114,408
Ceded (430,309) (343,529) (1,210,761) (1,030,028)
Net premiums earned 1,000,183 906,748 2,923,377 2,368,278
Claims and claim expenses        
Gross claims and claim expenses incurred 1,192,132 714,714 2,587,073 1,804,889
Claims and claim expenses recovered (250,102) (60,194) (563,817) (469,961)
Net claims and claim expenses incurred $ 942,030 $ 654,520 $ 2,023,256 $ 1,334,928