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Segment Reporting (Tables) | 3 Months Ended
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Mar. 31, 2018
Segment Reporting, Measurement Disclosures [Abstract] |
Schedule Of Significant Components Of The Company's Revenues And Expenses By Segment | A summary of the significant components of the Company’s revenues and expenses by segment is as follows:
| Three months ended March 31, 2018 | Property |  | Casualty and Specialty |  | Other |  | Total |
| Gross premiums written | $ | 706,968 |  |  | $ | 452,684 |  |  | $ | — |  |  | $ | 1,159,652 |  |
| Net premiums written | $ | 354,077 |  |  | $ | 308,967 |  |  | $ | — |  |  | $ | 663,044 |  |
| Net premiums earned | $ | 225,049 |  |  | $ | 215,233 |  |  | $ | — |  |  | $ | 440,282 |  |
| Net claims and claim expenses incurred | 30,607 |  |  | 141,078 |  |  | 18 |  |  | 171,703 |  |
| Acquisition expenses | 40,721 |  |  | 56,990 |  |  | — |  |  | 97,711 |  |
| Operational expenses | 26,546 |  |  | 14,593 |  |  | 133 |  |  | 41,272 |  |
| Underwriting income (loss) | $ | 127,175 |  |  | $ | 2,572 |  |  | $ | (151 | ) |  | 129,596 |  |
| Net investment income |  |  |  |  | 56,476 |  |  | 56,476 |  |
| Net foreign exchange gains |  |  |  |  | 3,757 |  |  | 3,757 |  |
| Equity in earnings of other ventures |  |  |  |  | 857 |  |  | 857 |  |
| Other loss |  |  |  |  | (1,242 | ) |  | (1,242 | ) |
| Net realized and unrealized losses on investments |  |  |  |  | (82,144 | ) |  | (82,144 | ) |
| Corporate expenses |  |  |  |  | (6,733 | ) |  | (6,733 | ) |
| Interest expense |  |  |  |  | (11,767 | ) |  | (11,767 | ) |
| Income before taxes |  |  |  |  |  |  | 88,800 |  |
| Income tax benefit |  |  |  |  | 3,407 |  |  | 3,407 |  |
| Net income attributable to redeemable noncontrolling interests |  |  |  |  | (29,899 | ) |  | (29,899 | ) |
| Dividends on preference shares |  |  |  |  | (5,595 | ) |  | (5,595 | ) |
| Net income available to RenaissanceRe common shareholders |  |  |  |  |  |  | $ | 56,713 |  |
| Net claims and claim expenses incurred – current accident year | $ | 58,169 |  |  | $ | 144,869 |  |  | $ | — |  |  | $ | 203,038 |  |
| Net claims and claim expenses incurred – prior accident years | (27,562 | ) |  | (3,791 | ) |  | 18 |  |  | (31,335 | ) |
| Net claims and claim expenses incurred – total | $ | 30,607 |  |  | $ | 141,078 |  |  | $ | 18 |  |  | $ | 171,703 |  |
| Net claims and claim expense ratio – current accident year | 25.8 | % |  | 67.3 | % |  |  |  | 46.1 | % |
| Net claims and claim expense ratio – prior accident years | (12.2 | )% |  | (1.8 | )% |  |  |  | (7.1 | )% |
| Net claims and claim expense ratio – calendar year | 13.6 | % |  | 65.5 | % |  |  |  | 39.0 | % |
| Underwriting expense ratio | 29.9 | % |  | 33.3 | % |  |  |  | 31.6 | % |
| Combined ratio | 43.5 | % |  | 98.8 | % |  |  |  | 70.6 | % |
| Three months ended March 31, 2017 | Property |  | Casualty and Specialty |  | Other |  | Total |
| Gross premiums written | $ | 520,529 |  |  | $ | 401,561 |  |  | $ | — |  |  | $ | 922,090 |  |
| Net premiums written | $ | 289,871 |  |  | $ | 254,265 |  |  | $ | — |  |  | $ | 544,136 |  |
| Net premiums earned | $ | 186,988 |  |  | $ | 179,059 |  |  | $ | (2 | ) |  | $ | 366,045 |  |
| Net claims and claim expenses incurred | 38,838 |  |  | 154,571 |  |  | (328 | ) |  | 193,081 |  |
| Acquisition expenses | 29,103 |  |  | 54,179 |  |  | — |  |  | 83,282 |  |
| Operational expenses | 27,665 |  |  | 19,607 |  |  | 11 |  |  | 47,283 |  |
| Underwriting income (loss) | $ | 91,382 |  |  | $ | (49,298 | ) |  | $ | 315 |  |  | 42,399 |  |
| Net investment income |  |  |  |  | 54,325 |  |  | 54,325 |  |
| Net foreign exchange gains |  |  |  |  | 8,165 |  |  | 8,165 |  |
| Equity in losses of other ventures |  |  |  |  | (1,507 | ) |  | (1,507 | ) |
| Other income |  |  |  |  | 1,665 |  |  | 1,665 |  |
| Net realized and unrealized gains on investments |  |  |  |  | 43,373 |  |  | 43,373 |  |
| Corporate expenses |  |  |  |  | (5,286 | ) |  | (5,286 | ) |
| Interest expense |  |  |  |  | (10,526 | ) |  | (10,526 | ) |
| Income before taxes and noncontrolling interests |  |  |  |  |  |  | 132,608 |  |
| Income tax expense |  |  |  |  | (334 | ) |  | (334 | ) |
| Net income attributable to noncontrolling interests |  |  |  |  | (34,327 | ) |  | (34,327 | ) |
| Dividends on preference shares |  |  |  |  | (5,595 | ) |  | (5,595 | ) |
| Net income available to RenaissanceRe common shareholders |  |  |  |  |  |  | $ | 92,352 |  |
| Net claims and claim expenses incurred – current accident year | $ | 39,766 |  |  | $ | 124,309 |  |  | $ | — |  |  | $ | 164,075 |  |
| Net claims and claim expenses incurred – prior accident years | (928 | ) |  | 30,262 |  |  | (328 | ) |  | 29,006 |  |
| Net claims and claim expenses incurred – total | $ | 38,838 |  |  | $ | 154,571 |  |  | $ | (328 | ) |  | $ | 193,081 |  |
| Net claims and claim expense ratio – current accident year | 21.3 | % |  | 69.4 | % |  |  |  | 44.8 | % |
| Net claims and claim expense ratio – prior accident years | (0.5 | )% |  | 16.9 | % |  |  |  | 7.9 | % |
| Net claims and claim expense ratio – calendar year | 20.8 | % |  | 86.3 | % |  |  |  | 52.7 | % |
| Underwriting expense ratio | 30.3 | % |  | 41.2 | % |  |  |  | 35.7 | % |
| Combined ratio | 51.1 | % |  | 127.5 | % |  |  |  | 88.4 | % |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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