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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 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Premiums Written                      
Direct                 $ 612,172 $ 461,409 $ 337,587
Assumed                 5,193,993 4,346,341 2,972,840
Ceded                 (1,709,832) (1,426,257) (1,178,525)
Net premiums written $ 746,311 $ 899,411 $ 1,180,803 $ 1,269,808 $ 725,367 $ 704,130 $ 1,022,965 $ 929,031 4,096,333 3,381,493 2,131,902
Premiums Earned                      
Direct                 536,595 404,525 292,219
Assumed                 5,078,682 4,348,261 2,779,796
Ceded                 (1,662,815) (1,414,383) (1,095,886)
Net premiums earned (Note 7) 1,029,085 1,000,183 1,010,096 913,098 970,125 906,748 911,502 550,028 3,952,462 3,338,403 1,976,129
Claims and Claim Expenses                      
Gross claims and claim expenses incurred                 3,893,204 3,221,778 2,578,536
Claims and claim expenses recovered                 (968,595) (1,124,757) (1,458,518)
Net claims and claim expenses incurred $ 901,353 $ 942,030 $ 510,272 $ 570,954 $ 762,093 $ 654,520 $ 453,373 $ 227,035 $ 2,924,609 $ 2,097,021 $ 1,120,018