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Fair Value Measurements (Quantitative Information Used as Level 3 Inputs) (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
year
$ / shares
Dec. 31, 2017
USD ($)
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other assets (liabilities) $ (14,208) $ (5,494)
Total other assets and (liabilities) 5,259 2,542
Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other assets (liabilities) (7,355)  
Total other assets and (liabilities)   1,684
Fair Value, Measurements, Recurring | Fair Value (Level 3)    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other assets (liabilities) (8,949) $ (2,952)
Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3)    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other assets (liabilities) (8,949)  
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3)    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Total other assets and (liabilities) 994  
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3)    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other assets (liabilities) $ (9,943)  
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | Low    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs | $ / shares 101.31  
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | High    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs | $ / shares 111.12  
Bond price | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs | $ / shares 106.80  
Liquidity discount | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group one | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs 0.013  
Net undiscounted cash flows | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs (10,180,000)  
Expected loss ratio | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs 0.382  
Net acquisition expense ratio | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs (0.049)  
Contract period | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | Low    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs | year 2.0  
Contract period | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | High    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs | year 5.0  
Contract period | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs | year 4.7  
Discount rate | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs 0.030