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Reinsurance (Tables) | 9 Months Ended
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Sep. 30, 2017
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [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, 2017 |  | September 30, 2016 |  | September 30, 2017 |  | September 30, 2016 |
| Premiums written |  |  |  |  |  |  |  |
| Direct | $ | 64,040 |  |  | $ | 53,488 |  |  | $ | 205,253 |  |  | $ | 154,205 |  |
| Assumed | 576,229 |  |  | 376,736 |  |  | 2,184,521 |  |  | 1,897,280 |  |
| Ceded | (157,048 | ) |  | (146,002 | ) |  | (806,672 | ) |  | (735,672 | ) |
| Net premiums written | $ | 483,221 |  |  | $ | 284,222 |  |  | $ | 1,583,102 |  |  | $ | 1,315,813 |  |
| Premiums earned |  |  |  |  |  |  |  |
| Direct | $ | 61,908 |  |  | $ | 43,097 |  |  | $ | 176,433 |  |  | $ | 114,173 |  |
| Assumed | 712,499 |  |  | 471,097 |  |  | 1,731,845 |  |  | 1,392,278 |  |
| Ceded | (226,615 | ) |  | (167,673 | ) |  | (612,176 | ) |  | (454,922 | ) |
| Net premiums earned | $ | 547,792 |  |  | $ | 346,521 |  |  | $ | 1,296,102 |  |  | $ | 1,051,529 |  |
| Claims and claim expenses |  |  |  |  |  |  |  |
| Gross claims and claim expenses incurred | $ | 2,482,510 |  |  | $ | 153,846 |  |  | $ | 2,924,217 |  |  | $ | 540,696 |  |
| Claims and claim expenses recovered | (1,260,814 | ) |  | (41,271 | ) |  | (1,366,853 | ) |  | (133,766 | ) |
| Net claims and claim expenses incurred | $ | 1,221,696 |  |  | $ | 112,575 |  |  | $ | 1,557,364 |  |  | $ | 406,930 |  |

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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://www.xbrl.org/2003/role/presentationRef -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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- References No definition available. + Details
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