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Fair Value Measurements (Narrative) (Details) (USD $) | 3 Months Ended |  | 3 Months Ended |  |  |  |  |  |  |  |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended |
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Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Other Investments Net investment income | Dec. 31, 2013 Other Investments Net investment income | Mar. 31, 2010 5.75% Senior Notes Due March 15, 2020 RenRe North America Holdings Inc. | Mar. 31, 2014 5.75% Senior Notes Due March 15, 2020 RenRe North America Holdings Inc. | Dec. 31, 2013 5.75% Senior Notes Due March 15, 2020 RenRe North America Holdings Inc. | Mar. 17, 2010 5.75% Senior Notes Due March 15, 2020 RenRe North America Holdings Inc. | Mar. 31, 2014 Significant Other Observable Inputs (Level 2) | Dec. 31, 2013 Significant Other Observable Inputs (Level 2) | Mar. 31, 2014 Significant Other Observable Inputs (Level 2) Cash Settled Restricted Stock Unit | Mar. 31, 2014 Fair Value, Inputs, (Level 3) | Dec. 31, 2013 Fair Value, Inputs, (Level 3) | Mar. 31, 2014 Fair Value, Inputs, (Level 3) Hedge funds Net Asset Valuation Technique | Mar. 31, 2014 Fair Value, Inputs, (Level 3) Hedge funds Minimum Net Asset Valuation Technique | Mar. 31, 2014 Fair Value, Inputs, (Level 3) Hedge funds Maximum Net Asset Valuation Technique | Mar. 31, 2014 Fair Value, Inputs, (Level 3) Hedge funds Weighted Average or Actual Net Asset Valuation Technique | Mar. 31, 2014 Fair Value, Inputs, (Level 3) Senior secured bank loan funds Net Asset Valuation Technique | Mar. 31, 2014 Fair Value, Inputs, (Level 3) Senior secured bank loan funds Weighted Average or Actual Net Asset Valuation Technique | Mar. 31, 2014 Fair Value, Inputs, (Level 3) Private equity partnerships Net Asset Valuation Technique | Mar. 31, 2014 Fair Value, Inputs, (Level 3) Private equity partnerships Minimum Net Asset Valuation Technique | Mar. 31, 2014 Fair Value, Inputs, (Level 3) Private equity partnerships Maximum Net Asset Valuation Technique | Mar. 31, 2014 Fair Value, Inputs, (Level 3) Private equity partnerships Weighted Average or Actual Net Asset Valuation Technique | Mar. 31, 2014 Fair Value, Inputs, (Level 3) Corporate Discounted Cash Flow Valuation Technique | Mar. 31, 2014 Fair Value, Inputs, (Level 3) Corporate Internal Valuation Model Valuation Technique | Mar. 31, 2014 Fair Value, Inputs, (Level 3) Corporate Weighted Average or Actual Discounted Cash Flow Valuation Technique | Mar. 31, 2014 Fair Value, Inputs, (Level 3) Private Equity Funds Net Asset Valuation Technique | Mar. 31, 2014 Fair Value, Inputs, (Level 1) | Dec. 31, 2013 Fair Value, Inputs, (Level 1) | Mar. 31, 2014 U.S. treasuries | Dec. 31, 2013 U.S. treasuries | Mar. 31, 2014 Agencies | Dec. 31, 2013 Agencies | Mar. 31, 2014 Non-U.S. government (Sovereign Debt) | Dec. 31, 2013 Non-U.S. government (Sovereign Debt) | Mar. 31, 2014 Non-U.S. government-backed corporate | Dec. 31, 2013 Non-U.S. government-backed corporate | Mar. 31, 2014 Corporate | Dec. 31, 2013 Corporate | Mar. 31, 2014 Agency mortgage-backed | Dec. 31, 2013 Agency mortgage-backed | Mar. 31, 2014 Non-agency prime residential mortgage-backed | Dec. 31, 2013 Non-agency prime residential mortgage-backed | Mar. 31, 2014 AltA non-agency mortgage-backed | Dec. 31, 2013 AltA non-agency mortgage-backed | Mar. 31, 2014 Commercial mortgage-backed | Dec. 31, 2013 Commercial mortgage-backed | Mar. 31, 2014 Asset-backed | Dec. 31, 2013 Asset-backed | Mar. 31, 2014 Senior secured bank loan funds | Mar. 31, 2014 Private equity partnerships | Mar. 31, 2014 Hedge funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities, fair value |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,307,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average effective yield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.90% | 0.80% | 1.60% | 1.30% | 1.10% | 1.30% | 1.30% | 1.10% | 2.90% | 2.70% | 2.70% | 2.90% | 3.30% | 3.70% | 4.30% | 4.70% | 2.10% | 2.10% | 1.60% | 2.00% |  |  |
Weighted average life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years 0 months 0 days | 6 years 2 months 12 days | 4 years 4 months 24 days | 4 years 4 months 24 days | 4 years 4 months 24 days | 4 years | 3 years 9 months 18 days | 3 years 3 months 18 days | 2 years 9 months 18 days | 3 years 6 months |  |  |
Assets and (liabilities) at fair value | 3,428,000 |  | (8,233,000) |  |  |  |  |  |  | 4,059,000 | (6,566,000) | (1,400,000) | (1,307,000) | (2,490,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 676,000 | 823,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value |  |  |  |  |  |  |  |  |  |  |  |  | 378,609,000 |  | 3,411,000 |  |  |  | 13,656,000 |  | 325,711,000 |  |  |  | 15,846,000 | 21,292,000 |  | 325,711,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit spread |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated performance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00% |  | 0.90% |  | (4.40%) | 75.50% | 4.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.75% Senior notes issued |  |  |  |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes interest rate |  |  |  |  |  |  | 5.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  |  |  | March 15, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes, Fair value |  |  |  |  |  |  | 264,200,000 | 273,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) recognized in earnings | 4,980,000 | 15,071,000 |  | 5,000,000 | 15,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum estimated liquidation period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years | 7 years |
Maximum estimated liquidation period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 10 years |
Investment in closed end fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,700,000 |  |
Hedge fund side pocket investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,400,000

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