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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) (USD $) In Thousands, unless otherwise specified |  |  |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |
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Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Corporate Discounted Cash Flow Valuation Technique | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Corporate Discounted Cash Flow Valuation Technique Weighted Average or Actual | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Corporate Internal Valuation Model Valuation Technique | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Fixed maturity investments | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique Low | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique Maximum | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique Weighted Average or Actual | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Senior secured bank loan funds Net Asset Valuation Technique | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Senior secured bank loan funds Net Asset Valuation Technique Weighted Average or Actual | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique Low | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique Maximum | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique Weighted Average or Actual | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Other Investments | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Weather Contract Internal Valuation Model Valuation Technique | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Senior secured bank loan funds Net Asset Valuation Technique | Jun. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value |  |  | $ 381,396 | $ 15,938 |  | $ 30,238 | $ 46,176 | $ 314,983 |  |  |  | $ 15,976 |  | $ 3,190 |  |  |  | $ 334,149 |  | $ 314,983 | $ 15,976 | $ 3,190
Liabilities, fair value |  |  | 1,071 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,149) |  |  |
Derivative Asset | $ 9,946 | $ 10,667 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit spread |  |  |  |  | 1.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity discount |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free rate |  |  |  |  | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate |  |  |  |  | 6.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated performance |  |  |  |  |  |  |  |  | (3.00%) | 18.90% | 4.00% |  | 0.70% |  | 0.00% | 0.00% | 0.00% |  |  |  |  |

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