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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

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