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Variable Interest Entities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Variable Interest Entity [Line Items] |  |  |  |  |
Contributions to subsidiaries |  |  | $ 0 | $ 0 |
Assets | $ 12,659,531 |  | 12,659,531 |  | $ 11,555,287
Liabilities | 6,687,188 |  | 6,687,188 |  | 5,777,139
Ceded premiums written | 146,002 | $ 102,822 | 735,672 | 495,685 |
Ceded premiums earned | 167,673 | $ 120,609 | 454,922 | 339,503 |
Upsilon Reinsurance Fund Opportunities Ltd. | Variable Interest Entity, Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Return of capital |  |  | 242,500 |  | 420,200
Assets | 215,400 |  | 215,400 |  | 250,600
Liabilities | 215,400 |  | 215,400 |  | 250,500
Upsilon Reinsurance Fund Opportunities Ltd. | Variable Interest Entity, Primary Beneficiary | Non-Voting Preference Shares |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Issuance of equity to third party investors |  |  | 166,600 |  | 153,700
Contributions to subsidiaries |  |  | 55,200 |  | 42,500
Upsilon Reinsurance Fund Opportunities Ltd. | Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd. |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Return of capital |  |  | $ 59,800 |  | $ 132,300
Variable interest entity, ownership percentage |  |  | 28.90% |  | 21.70%
Mona Lisa Re Ltd | Renaissance Reinsurance Ltd. |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Ceded premiums written |  |  | $ 7,400 | 7,300 |
Ceded premiums earned |  |  | 5,400 | 5,400 |
Mona Lisa Re Ltd | DaVinci Reinsurance Ltd. |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Ceded premiums written |  |  | 5,100 | 5,000 |
Ceded premiums earned |  |  | 3,700 | $ 3,700 |
Mona Lisa Re Ltd | Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Assets | 187,500 |  | 187,500 |  | $ 184,000
Liabilities | $ 187,500 |  | $ 187,500 |  | $ 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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