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Variable Interest Entities (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 01, 2017 | Jan. 01, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Assets |  |  | $ 15,044,924 |  | $ 15,044,924 |  | $ 12,352,082
Liabilities |  |  | 9,608,183 |  | 9,608,183 |  | 6,309,911
Ceded premiums written |  |  | 157,048 | $ 146,002 | 806,672 | $ 735,672 |
Ceded premiums earned |  |  | 226,615 | $ 167,673 | 612,176 | 454,922 |
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Return of capital |  |  |  |  | 84,300 |  | 242,500
Assets |  |  | 453,800 |  | 453,800 |  | 193,000
Liabilities |  |  | 453,900 |  | 453,900 |  | 193,000
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Non-Voting Preference Shares |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Issuance of equity to third party investors |  |  |  |  | 134,100 |  | 166,600
Contributions to subsidiaries |  |  |  |  | 9,500 |  | 55,200
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Return of capital |  |  |  |  | $ 33,000 |  | $ 59,800
Variable interest entity, ownership percentage |  |  |  |  | 10.10% |  | 28.80%
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Third party investor | Non-Voting Preference Shares |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Contributions to subsidiaries |  |  |  |  | $ 7,500 |  |
Variable Interest Entity, Primary Beneficiary | Renaissance Reinsurance Ltd. | Fibonacci Reinsurance Ltd. |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ceded premiums written |  |  |  |  | 9,400 |  |
Ceded premiums earned |  |  |  |  | 6,200 |  |
Variable Interest Entity, Primary Beneficiary | Fibonacci Reinsurance Ltd. |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Issuance of equity to third party investors | $ 45,000 | $ 140,000 |  |  |  |  |
Variable Interest Entity, Primary Beneficiary | Fibonacci Reinsurance Ltd. | Other Investments |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Investment in participating notes |  |  | 16,300 |  | 16,300 |  |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Assets |  |  | 26,100 |  | 26,100 |  | $ 184,200
Liabilities |  |  | $ 26,100 |  | 26,100 |  | $ 184,200
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd | Renaissance Reinsurance Ltd. |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ceded premiums written |  |  |  |  | 200 | 7,400 |
Ceded premiums earned |  |  |  |  | 4,000 | 5,400 |
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd | DaVinci Reinsurance Ltd. |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Ceded premiums written |  |  |  |  | 224 | 5,100 |
Ceded premiums earned |  |  |  |  | $ 2,800 | $ 3,700 |

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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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