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Fair Value of Assets and Liabilities (Quantitative Info for Level 3 Inputs) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Corporate securities [1] $ 36,688 $ 38,793
Future policy benefits 16,498,119 18,561,550
Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Corporate securities 36,688 38,793
Future policy benefits $ 2,908,324 5,452,583
Level 3 | Minimum    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair Value Inputs, Policyholder Age 50 years  
Level 3 | Minimum | Future Policy Benefits    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Mortality rate 0.00%  
Level 3 | Maximum    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Fair Value Inputs, Policyholder Age 90 years  
Level 3 | Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Corporate securities $ 0 0
Future policy benefits $ 2,908,324 $ 5,452,583
Level 3 | Internal | Minimum | Discounted cash flow | Future Policy Benefits    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Lapse rate 1.00% 1.00%
Spread over LIBOR 0.16% 0.12%
Utilization rate 50.00% 52.00%
Withdrawal rate (greater than maximum range) 78.00% 78.00%
Mortality rate 0.00% 0.00%
Equity volatility curve 14.00% 13.00%
Level 3 | Internal | Minimum | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount Rate 7.00% 5.06%
Level 3 | Internal | Minimum | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 6.00% 25.00%
Level 3 | Internal | Maximum | Discounted cash flow | Future Policy Benefits    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Lapse rate 13.00% 12.00%
Spread over LIBOR 1.21% 1.10%
Utilization rate 97.00% 97.00%
Withdrawal rate (greater than maximum range) 100.00% 100.00%
Mortality rate 15.00% 14.00%
Equity volatility curve 22.00% 24.00%
Level 3 | Internal | Maximum | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount Rate 20.00% 22.23%
Level 3 | Internal | Maximum | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 54.00% 25.00%
Level 3 | Internal | Weighted Average | Discounted cash flow | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount Rate 9.96% 7.33%
Level 3 | Internal | Weighted Average | Liquidation | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Liquidation value 51.00% 25.00%
Level 3 | Internal | Fair Value, Measurements, Recurring | Future Policy Benefits    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Future policy benefits $ 2,908,324 $ 5,452,583
Level 3 | Internal | Fair Value, Measurements, Recurring | Corporate securities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Corporate securities 20,938 36,966
Level 3 | Internal | Fair Value, Measurements, Recurring | Reinsurance Recoverables    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Reinsurance recoverables $ 2,958,093 $ 5,457,649
[1] Prior period amounts have been reclassified to conform to current period presentation. See "Adoption of ASU 2016-01" in Note 2 for details