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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details) - Internal Valuation Model - Significant Unobservable Inputs (Level 3) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Jun. 30, 2017
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other assets and (liabilities)   $ (9,502)
Assumed reinsurance contract    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Assets, fair value   $ 809
Assumed reinsurance contract | Low    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Bond price (in dollars per share) $ 101.59  
Assumed reinsurance contract | High    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Bond price (in dollars per share) 111.15  
Assumed reinsurance contract | Weighted Average or Actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Bond price (in dollars per share) $ 106.94  
Liquidity discount   1.30%
Assumed and ceded (re)insurance contract    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other assets and (liabilities)   $ (10,311)
Assumed and ceded (re)insurance contract | Low    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Contract period   2 years
Assumed and ceded (re)insurance contract | High    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Contract period   4 years 7 months 27 days
Assumed and ceded (re)insurance contract | Weighted Average or Actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Net undiscounted cash flows   $ (12,715)
Expected loss ratio   30.60%
Net acquisition expense ratio   (17.40%)
Contract period   4 years 6 months
Discount rate   1.90%