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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
$ / bond
Dec. 31, 2014
USD ($)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Other assets and (liabilities) $ 87,839 $ 87,839 $ 5,664
Significant Unobservable Inputs (Level 3)      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Assets, fair value 335,279 335,279  
Other assets and (liabilities) 76,949 76,949  
Corporate | Significant Unobservable Inputs (Level 3) | Discounted Cash Flow Valuation Technique      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Assets, fair value 7,595 $ 7,595  
Corporate | Significant Unobservable Inputs (Level 3) | Discounted Cash Flow Valuation Technique | Weighted Average or Actual      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Credit spread   4.30%  
Liquidity discount   1.00%  
Risk-free rate   0.30%  
Dividend rate   6.50%  
Fixed maturity investments | Significant Unobservable Inputs (Level 3)      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Assets, fair value 7,595 $ 7,595  
Private equity partnerships | Significant Unobservable Inputs (Level 3) | Net Asset Valuation Technique      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Assets, fair value $ 226,000 226,000  
Private equity partnerships | Significant Unobservable Inputs (Level 3) | Net Asset Valuation Technique | Low      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Estimated performance (25.10%)    
Private equity partnerships | Significant Unobservable Inputs (Level 3) | Net Asset Valuation Technique | Maximum      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Estimated performance 12.00%    
Private equity partnerships | Significant Unobservable Inputs (Level 3) | Net Asset Valuation Technique | Weighted Average or Actual      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Estimated performance (5.30%)    
Senior secured bank loan funds | Significant Unobservable Inputs (Level 3) | Net Asset Valuation Technique      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Assets, fair value $ 22,345 22,345  
Senior secured bank loan funds | Significant Unobservable Inputs (Level 3) | Net Asset Valuation Technique | Weighted Average or Actual      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Estimated performance 0.10%    
Hedge funds | Significant Unobservable Inputs (Level 3) | Net Asset Valuation Technique      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Assets, fair value $ 2,390 2,390  
Hedge funds | Significant Unobservable Inputs (Level 3) | Net Asset Valuation Technique | Low      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Estimated performance 0.00%    
Hedge funds | Significant Unobservable Inputs (Level 3) | Net Asset Valuation Technique | Maximum      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Estimated performance 0.00%    
Hedge funds | Significant Unobservable Inputs (Level 3) | Net Asset Valuation Technique | Weighted Average or Actual      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Estimated performance 0.00%    
Other Investments | Significant Unobservable Inputs (Level 3)      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Assets, fair value $ 250,735 250,735  
Reinsurance deposit asset | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Assets, fair value 83,517 $ 83,517  
Reinsurance deposit asset | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique | Weighted Average or Actual      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Estimated performance   3.00%  
Assumed reinsurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Assets, fair value 1,179 $ 1,179  
Assumed reinsurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique | Low      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Bond price | $ / bond   93.91  
Assumed reinsurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique | Maximum      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Bond price | $ / bond   99.91  
Assumed reinsurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique | Weighted Average or Actual      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Liquidity discount   1.30%  
Bond price | $ / bond   97.20  
Assumed and ceded (re)insurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Liabilities, fair value (5,386) $ (5,386)  
Assumed and ceded (re)insurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique | Low      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Contract period   6 months 10 days  
Assumed and ceded (re)insurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique | Maximum      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Contract period   3 years 3 days  
Assumed and ceded (re)insurance contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique | Weighted Average or Actual      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Net undiscounted cash flows   $ (9,727)  
Expected loss ratio   23.00%  
Net acquisition expense ratio   15.00%  
Contract period   2 years 3 months 3 days  
Discount rate   0.90%  
Assumed and ceded (re)insurance contracts | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Assets, fair value 76,952 $ 76,952  
Weather Contract | Significant Unobservable Inputs (Level 3) | Internal Valuation Model Valuation Technique      
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]      
Liabilities, fair value $ (3) $ (3)