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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Premiums written        
Direct $ 255,148 $ 138,208 $ 739,999 $ 463,462
Assumed 1,519,032 1,004,850 5,780,781 4,407,189
Ceded (287,740) (243,647) (1,697,965) (1,520,629)
Net premiums written 1,486,440 899,411 4,822,815 3,350,022
Premiums earned        
Direct 216,658 128,621 567,161 401,177
Assumed 1,798,229 1,301,871 4,669,877 3,732,961
Ceded (508,622) (430,309) (1,384,147) (1,210,761)
Net premiums earned 1,506,265 1,000,183 3,852,891 2,923,377
Claims and claim expenses        
Gross claims and claim expenses incurred 3,063,826 1,192,132 4,980,178 2,587,073
Claims and claim expenses recovered (1,265,781) (250,102) (1,795,061) (563,817)
Net claims and claim expenses incurred $ 1,798,045 $ 942,030 $ 3,185,117 $ 2,023,256