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Reinsurance (Tables) | 12 Months Ended
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Dec. 31, 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:
| Year ended December 31, | 2017 |  | 2016 |  | 2015 |
| Premiums written |  |  |  |  |  |
| Direct | $ | 290,730 |  |  | $ | 208,282 |  |  | $ | 130,681 |  |
| Assumed | 2,506,810 |  |  | 2,166,294 |  |  | 1,880,629 |  |
| Ceded | (926,215 | ) |  | (839,264 | ) |  | (595,127 | ) |
| Net premiums written | $ | 1,871,325 |  |  | $ | 1,535,312 |  |  | $ | 1,416,183 |  |
| Premiums earned |  |  |  |  |  |
| Direct | $ | 244,285 |  |  | $ | 157,112 |  |  | $ | 98,182 |  |
| Assumed | 2,307,219 |  |  | 1,874,993 |  |  | 1,769,088 |  |
| Ceded | (833,929 | ) |  | (628,675 | ) |  | (466,719 | ) |
| Net premiums earned | $ | 1,717,575 |  |  | $ | 1,403,430 |  |  | $ | 1,400,551 |  |
| Claims and claim expenses |  |  |  |  |  |
| Gross claims and claim expenses incurred | $ | 3,420,388 |  |  | $ | 710,651 |  |  | $ | 544,972 |  |
| Claims and claim expenses recovered | (1,558,960 | ) |  | (179,820 | ) |  | (96,734 | ) |
| Net claims and claim expenses incurred | $ | 1,861,428 |  |  | $ | 530,831 |  |  | $ | 448,238 |  |

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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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