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Reinsurance (Tables) | 6 Months Ended
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Jun. 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 |  | Six months ended |
|  | June 30, 2017 |  | June 30, 2016 |  | June 30, 2017 |  | June 30, 2016 |
| Premiums written |  |  |  |  |  |  |  |
| Direct | $ | 67,805 |  |  | $ | 57,541 |  |  | $ | 141,213 |  |  | $ | 100,717 |  |
| Assumed | 759,610 |  |  | 701,587 |  |  | 1,608,292 |  |  | 1,520,544 |  |
| Ceded | (271,670 | ) |  | (239,212 | ) |  | (649,624 | ) |  | (589,670 | ) |
| Net premiums written | $ | 555,745 |  |  | $ | 519,916 |  |  | $ | 1,099,881 |  |  | $ | 1,031,591 |  |
| Premiums earned |  |  |  |  |  |  |  |
| Direct | $ | 56,357 |  |  | $ | 37,936 |  |  | $ | 114,525 |  |  | $ | 71,076 |  |
| Assumed | 520,347 |  |  | 464,540 |  |  | 1,019,346 |  |  | 921,181 |  |
| Ceded | (194,439 | ) |  | (151,074 | ) |  | (385,561 | ) |  | (287,249 | ) |
| Net premiums earned | $ | 382,265 |  |  | $ | 351,402 |  |  | $ | 748,310 |  |  | $ | 705,008 |  |
| Claims and claim expenses |  |  |  |  |  |  |  |
| Gross claims and claim expenses incurred | $ | 189,903 |  |  | $ | 224,852 |  |  | $ | 441,707 |  |  | $ | 386,850 |  |
| Claims and claim expenses recovered | (47,316 | ) |  | (57,102 | ) |  | (106,039 | ) |  | (92,495 | ) |
| Net claims and claim expenses incurred | $ | 142,587 |  |  | $ | 167,750 |  |  | $ | 335,668 |  |  | $ | 294,355 |  |

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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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