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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Total other assets and (liabilities) $ 2,542 $ 4,379
Significant Unobservable Inputs (Level 3)    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Total other assets and (liabilities) (2,952)  
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model Valuation Technique    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other assets and (liabilities) $ 850  
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model Valuation Technique | Low    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Assumed and ceded (re)insurance contracts, Bond price, Unobservable and Observable Inputs (in usd per share) $ 101.53  
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model Valuation Technique | Maximum    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Assumed and ceded (re)insurance contracts, Bond price, Unobservable and Observable Inputs (in usd per share) 111.56  
Significant Unobservable Inputs (Level 3) | Assumed reinsurance contract | Internal Valuation Model Valuation Technique | Weighted average or actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Assumed and ceded (re)insurance contracts, Bond price, Unobservable and Observable Inputs (in usd per share) $ 107.15  
Liquidity discount 1.30%  
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts | Internal Valuation Model Valuation Technique    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Assumed and ceded (re)insurance contracts $ 3,802  
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts | Internal Valuation Model Valuation Technique | Low    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Contract period 2 years  
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts | Internal Valuation Model Valuation Technique | Maximum    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Contract period 4 years 8 months 12 days  
Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts | Internal Valuation Model Valuation Technique | Weighted average or actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Net undiscounted cash flows $ (4,626)  
Expected loss ratio 22.10%  
Net acquisition expense ratio 13.50%  
Contract period 4 years 1 month 6 days  
Discount rate 2.20%