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Reinsurance (Tables) | 9 Months Ended
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Sep. 30, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract] |
Effect of Reinsurance and Retrocessional Activity on Premiums Written and Earned and on Net Claims and Claim Expenses Incurred | The following table sets forth the effect of reinsurance and retrocessional activity on premiums written and earned and on net claims and claim expenses incurred:
|  | Three months ended |  | Nine months ended |
|  | September 30, 2018 |  | September 30, 2017 |  | September 30, 2018 |  | September 30, 2017 |
| Premiums written |  |  |  |  |  |  |  |
| Direct | $ | 74,635 |  |  | $ | 64,040 |  |  | $ | 250,375 |  |  | $ | 205,253 |  |
| Assumed | 551,042 |  |  | 576,229 |  |  | 2,512,297 |  |  | 2,184,521 |  |
| Ceded | (172,422 | ) |  | (157,048 | ) |  | (1,041,864 | ) |  | (806,672 | ) |
| Net premiums written | $ | 453,255 |  |  | $ | 483,221 |  |  | $ | 1,720,808 |  |  | $ | 1,583,102 |  |
| Premiums earned |  |  |  |  |  |  |  |
| Direct | $ | 73,356 |  |  | $ | 61,908 |  |  | $ | 213,292 |  |  | $ | 176,433 |  |
| Assumed | 760,920 |  |  | 712,499 |  |  | 1,968,138 |  |  | 1,731,845 |  |
| Ceded | (302,427 | ) |  | (226,615 | ) |  | (779,914 | ) |  | (612,176 | ) |
| Net premiums earned | $ | 531,849 |  |  | $ | 547,792 |  |  | $ | 1,401,516 |  |  | $ | 1,296,102 |  |
| Claims and claim expenses |  |  |  |  |  |  |  |
| Gross claims and claim expenses incurred | $ | 514,873 |  |  | $ | 2,482,510 |  |  | $ | 817,560 |  |  | $ | 2,924,217 |  |
| Claims and claim expenses recovered | (104,363 | ) |  | (1,260,814 | ) |  | (175,180 | ) |  | (1,366,853 | ) |
| Net claims and claim expenses incurred | $ | 410,510 |  |  | $ | 1,221,696 |  |  | $ | 642,380 |  |  | $ | 1,557,364 |  |

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- Definition Tabular disclosure of the effects of reinsurance, for example, but not limited to, disclosure of direct, assumed, and ceded insurance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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