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Variable Interest Entities (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 3 Months Ended | 9 Months Ended |  |  | 0 Months Ended | 3 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2013 Upsilon RFO Variable Interest Entity, Primary Beneficiary | Jan. 02, 2013 Upsilon RFO Variable Interest Entity, Primary Beneficiary | Jun. 30, 2014 Upsilon RFO Variable Interest Entity, Primary Beneficiary | Mar. 31, 2014 Upsilon RFO Variable Interest Entity, Primary Beneficiary | Sep. 30, 2014 Upsilon RFO Variable Interest Entity, Primary Beneficiary | Sep. 30, 2014 Mona Lisa Re Ltd Renaissance Reinsurance | Sep. 30, 2013 Mona Lisa Re Ltd Renaissance Reinsurance | Sep. 30, 2014 Mona Lisa Re Ltd DaVinciRe | Sep. 30, 2013 Mona Lisa Re Ltd DaVinciRe | Sep. 30, 2014 Mona Lisa Re Ltd Variable Interest Entity, Not Primary Beneficiary | Dec. 31, 2013 Mona Lisa Re Ltd Variable Interest Entity, Not Primary Beneficiary | Jan. 02, 2013 Non-Voting Preference Shares Upsilon RFO Variable Interest Entity, Primary Beneficiary | Jun. 30, 2014 Non-Voting Preference Shares Upsilon RFO Variable Interest Entity, Primary Beneficiary | Mar. 31, 2014 Non-Voting Preference Shares Upsilon RFO Variable Interest Entity, Primary Beneficiary | Jul. 02, 2013 Non-Voting Preference Shares Upsilon RFO Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross premiums written | $ 200,992,000 | $ 182,649,000 | $ 1,417,792,000 | $ 1,521,290,000 |  |  | $ 53,500,000 |  |  |  | $ 8,600,000 | $ 9,200,000 | $ 6,300,000 | $ 1,200,000 |  |  |  |  |  |
Ceded premiums earned | 113,264,000 | 103,872,000 | 331,479,000 | 308,869,000 |  |  |  |  |  |  | 6,900,000 | 300,000 | 4,900,000 | 300,000 |  |  |  |  |  |
Issuance of equity to third party investors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61,000,000 | 43,100,000 | 172,400,000 |
Contributions to subsidiaries |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  | 76,400,000 | 13,500,000 | 109,700,000 |
Variable interest entity, ownership percentage |  |  |  |  |  | 25.80% | 55.60% | 23.90% | 38.90% |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in funds held under insurance agreements |  |  |  |  |  |  | 17,500,000 | 5,000,000 | 15,000,000 |  |  |  |  |  |  |  |  |  |  |
Risk participation percentage |  |  |  |  |  |  | 42.90% | 15.00% | 33.60% | 30.50% |  |  |  |  |  |  |  |  |  |
Proceeds from sale of partial interest in consolidated subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000
Assets | 8,356,935,000 |  | 8,356,935,000 |  | 8,179,131,000 | 474,200,000 |  |  |  | 463,900,000 |  |  |  |  | 187,110,000 | 209,615,000 |  |  |  |
Liabilities | 3,529,909,000 |  | 3,529,909,000 |  | 3,174,887,000 | 474,200,000 |  |  |  | 463,900,000 |  |  |  |  | 187,110,000 | 209,615,000 |  |  |  |
Other liabilities | $ 203,908,000 |  | $ 203,908,000 |  | $ 397,596,000 | $ 156,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Amount of earned premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=6588446&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486662&loc=d3e27175-158546 + Details
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