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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Premiums written                      
Direct                 $ 337,587 $ 290,730 $ 208,282
Assumed                 2,972,840 2,506,810 2,166,294
Ceded                 (1,178,525) (926,215) (839,264)
Net premiums written $ 411,094 $ 453,255 $ 604,509 $ 663,044 $ 288,223 $ 483,221 $ 555,745 $ 544,136 2,131,902 1,871,325 1,535,312
Premiums earned                      
Direct                 292,219 244,285 157,112
Assumed                 2,779,796 2,307,219 1,874,993
Ceded                 (1,095,886) (833,929) (628,675)
Net premiums earned (Note 6) 574,613 531,849 429,385 440,282 421,473 547,792 382,265 366,045 1,976,129 1,717,575 1,403,430
Claims and claim expenses                      
Gross claims and claim expenses incurred                 2,578,536 3,420,388 710,651
Claims and claim expenses recovered                 (1,458,518) (1,558,960) (179,820)
Net claims and claim expenses incurred $ 477,638 $ 410,510 $ 60,167 $ 171,703 $ 304,064 $ 1,221,696 $ 142,587 $ 193,081 $ 1,120,018 $ 1,861,428 $ 530,831