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Variable Interest Entities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Variable Interest Entity [Line Items] |  |  |
Total assets | $ 15,226,131 | $ 12,352,082 |
Total liabilities | 9,538,250 | 6,309,911 |
Ceded premiums written | 926,215 | 839,264 | $ 595,127
Ceded premiums earned | 833,929 | 628,675 | $ 466,719
Investments in other ventures, under equity method (Note 5) | 101,974 | 124,227 |
Upsilon RFO Re Ltd. | Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Return of capital | 84,300 | 242,500 |
Total assets | 1,200,000 | 193,000 |
Total liabilities | 1,200,000 | 193,000 |
Upsilon RFO Re Ltd. | Primary Beneficiary | Non-voting preference shares |  |  |
Variable Interest Entity [Line Items] |  |  |
Non-voting preference shares issued to third parties | 180,600 | 166,600 |
Investment in variable interest entity | 27,200 | 55,200 |
Upsilon RFO Re Ltd. | Primary Beneficiary | RenaissanceRe Holdings Ltd. |  |  |
Variable Interest Entity [Line Items] |  |  |
Return of capital | $ 33,000 | $ 59,800 |
Variable interest entity, ownership percentage | 20.80% | 28.80% |
Upsilon RFO Re Ltd. | Primary Beneficiary | Investor | Non-voting preference shares |  |  |
Variable Interest Entity [Line Items] |  |  |
Investment in variable interest entity | $ 7,500 |  |
Mona Lisa Re Ltd. | Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Total assets | 25,900 | $ 184,200 |
Total liabilities | 25,900 | 184,200 |
Mona Lisa Re Ltd. | Not Primary Beneficiary | Renaissance Reinsurance Ltd. |  |  |
Variable Interest Entity [Line Items] |  |  |
Ceded premiums written | 400 | 7,400 |
Ceded premiums earned | 4,100 | 7,300 |
Mona Lisa Re Ltd. | Not Primary Beneficiary | DaVinci Reinsurance Ltd. |  |  |
Variable Interest Entity [Line Items] |  |  |
Ceded premiums written | 400 | 5,100 |
Ceded premiums earned | 2,900 | $ 5,000 |
Renaissance Reinsurance Ltd. | Primary Beneficiary | Fibonacci Reinsurance Ltd. |  |  |
Variable Interest Entity [Line Items] |  |  |
Ceded premiums written | 9,000 |  |
Ceded premiums earned | 8,200 |  |
Fibonacci Reinsurance Ltd. | Primary Beneficiary | Other Investments |  |  |
Variable Interest Entity [Line Items] |  |  |
Fair value of investment | 14,100 |  |
Langhorne Holdings LLC | Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Investments in other ventures, under equity method (Note 5) | $ 600 |  |

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