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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  | 9 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  | 9 Months Ended |
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Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) | Dec. 31, 2013 Significant Unobservable Inputs (Level 3) | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Corporate Discounted Cash Flow Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Corporate Discounted Cash Flow Valuation Technique Weighted Average or Actual | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Fixed maturity investments | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique Low | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique Maximum | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique Weighted Average or Actual | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Senior secured bank loan funds Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Senior secured bank loan funds Net Asset Valuation Technique Weighted Average or Actual | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique Low | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique Maximum | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique Weighted Average or Actual | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Other Investments | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Assumed and ceded (re)insurance contracts Internal Valuation Model Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Assumed and ceded (re)insurance contracts Internal Valuation Model Valuation Technique Low D | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Assumed and ceded (re)insurance contracts Internal Valuation Model Valuation Technique Maximum D | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Assumed and ceded (re)insurance contracts Internal Valuation Model Valuation Technique Weighted Average or Actual D | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Weather Contract Internal Valuation Model Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Private equity partnerships Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Senior secured bank loan funds Net Asset Valuation Technique | Sep. 30, 2014 Significant Unobservable Inputs (Level 3) Hedge funds Net Asset Valuation Technique | Sep. 30, 2014 Call Rights Significant Unobservable Inputs (Level 3) Internal Valuation Model Valuation Technique
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit spread |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity discount |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free rate |  |  |  |  |  | 0.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend rate |  |  |  |  |  | 6.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated performance |  |  |  |  |  |  |  |  | (13.90%) | 8.30% | (0.40%) |  | 0.50% |  | 0.00% | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |
Net undiscounted cash flows |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140 | $ 6,284 | $ 3,784 |  |  |  |  |
Contract period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 824 | 1,100 | 857 |  |  |  |  |
Discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.80% |  |  |  |  |
Assets, fair value |  |  | 330,906 |  | 15,936 |  | 15,936 | 300,800 |  |  |  | 18,723 |  | 2,718 |  |  |  | 322,241 |  |  |  |  |  | 300,800 | 18,723 | 2,718 | 264
Liabilities, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,281) |  |  |  | (254) |  |  |  |
Other assets and (liabilities) | $ (17,272) | $ (8,233) | $ (7,271) | $ (2,490) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (7,281) |  |  |  |  |  |  |  |

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