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Reinsurance (Tables) | 3 Months Ended
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Mar. 31, 2018
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 |
|  | March 31, 2018 |  | March 31, 2017 |
| Premiums written |  |  |  |
| Direct | $ | 85,167 |  |  | $ | 73,408 |  |
| Assumed | 1,074,485 |  |  | 848,682 |  |
| Ceded | (496,608 | ) |  | (377,954 | ) |
| Net premiums written | $ | 663,044 |  |  | $ | 544,136 |  |
| Premiums earned |  |  |  |
| Direct | $ | 70,032 |  |  | $ | 58,168 |  |
| Assumed | 605,483 |  |  | 498,999 |  |
| Ceded | (235,233 | ) |  | (191,122 | ) |
| Net premiums earned | $ | 440,282 |  |  | $ | 366,045 |  |
| Claims and claim expenses |  |  |  |
| Gross claims and claim expenses incurred | $ | 225,742 |  |  | $ | 251,804 |  |
| Claims and claim expenses recovered | (54,039 | ) |  | (58,723 | ) |
| Net claims and claim expenses incurred | $ | 171,703 |  |  | $ | 193,081 |  |

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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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