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Variable Interest Entities (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 13, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Assets |  | $ 12,053,186 |  |  | $ 12,053,186 |  | $ 8,203,550
Liabilities |  | 6,227,430 |  |  | 6,227,430 |  | 3,206,127
Other liabilities |  | 228,554 |  |  | 228,554 |  | 374,108
Gross premiums written |  | 661,997 | $ 511,540 |  | 1,305,575 | $ 1,216,800 |
Ceded premiums earned |  | 110,150 | $ 104,922 |  | $ 218,894 | 218,215 |
RenaissanceRe Upsilon Fund Ltd | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Percent of segregated funds owned by third party investors | 100.00% |  |  |  |  |  |
Upsilon RFO | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Variable interest entity, ownership percentage |  |  | 23.90% | 38.90% | 20.50% |  |
Increase (decrease) in funds held under insurance agreements |  |  | $ 5,000 | $ 15,000 |  |  |
Risk participation percentage |  |  | 15.00% | 33.60% |  |  |
Total amount of capital agreed to be returned |  |  |  |  |  |  | 419,400
Return of capital to date |  |  |  |  | $ 418,500 |  |
Assets |  | 261,900 |  |  | 261,900 |  | 621,300
Liabilities |  | 261,900 |  |  | 261,900 |  | 621,300
Other liabilities |  |  |  |  |  |  | 135,700
Upsilon RFO | Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Total amount of capital agreed to be returned |  |  |  |  |  |  | 131,400
Return of capital to date |  |  |  |  | 131,100 |  |
Upsilon RFO | Variable Interest Entity, Primary Beneficiary | Non-Voting Preference Shares |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Issuance of equity to third party investors |  |  | $ 43,100 | $ 172,400 | 155,400 |  |
Contributions to subsidiaries |  |  | $ 13,500 | $ 109,700 | 42,200 |  |
Mona Lisa Re Ltd | Renaissance Reinsurance Ltd. |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Gross premiums written |  |  |  |  | 600 | 2,000 |
Ceded premiums earned |  |  |  |  | 3,600 | 5,000 |
Mona Lisa Re Ltd | DaVinciRe Holdings Ltd. |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Gross premiums written |  |  |  |  | 500 | 1,900 |
Ceded premiums earned |  |  |  |  | 2,500 | $ 3,600 |
Mona Lisa Re Ltd | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Assets |  | 179,000 |  |  | 179,000 |  | 184,000
Liabilities |  | $ 179,000 |  |  | $ 179,000 |  | $ 184,000

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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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