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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) (Fair Value, Inputs, (Level 3), USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Assets, fair value $ 378,609
Liabilities, fair value 1,307
Corporate | Discounted Cash Flow Valuation Technique
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Assets, fair value 15,846
Corporate | Discounted Cash Flow Valuation Technique | Weighted Average or Actual
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Credit spread 2.10%
Liquidity discount 1.00%
Risk-free rate 0.30%
Dividend rate 6.20%
Corporate | Internal Valuation Model Valuation Technique
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Assets, fair value 21,292
Fixed maturity investments
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Assets, fair value 37,138
Private equity partnerships | Net Asset Valuation Technique
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Assets, fair value 325,711
Private equity partnerships | Net Asset Valuation Technique | Low
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Estimated performance (4.40%)
Private equity partnerships | Net Asset Valuation Technique | Maximum
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Estimated performance 75.50%
Private equity partnerships | Net Asset Valuation Technique | Weighted Average or Actual
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Estimated performance 4.10%
Senior secured bank loan funds | Net Asset Valuation Technique
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Assets, fair value 13,656
Senior secured bank loan funds | Net Asset Valuation Technique | Weighted Average or Actual
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Estimated performance 0.90%
Hedge funds | Net Asset Valuation Technique
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Assets, fair value 3,411
Hedge funds | Net Asset Valuation Technique | Low
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Estimated performance 0.00%
Hedge funds | Net Asset Valuation Technique | Maximum
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Estimated performance 0.00%
Hedge funds | Net Asset Valuation Technique | Weighted Average or Actual
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Estimated performance 0.00%
Other Investments
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Assets, fair value 342,778
Weather Contract | Internal Valuation Model Valuation Technique
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Liabilities, fair value 1,307
Private equity partnerships | Net Asset Valuation Technique
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Assets, fair value 325,711
Senior secured bank loan funds | Net Asset Valuation Technique
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Assets, fair value 13,656
Hedge funds | Net Asset Valuation Technique
  
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]  
Assets, fair value $ 3,411