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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, 2016
Dec. 31, 2015
Fair Value Quantiative Information [Line Items]    
Future policy benefits $ 20,096,101 $ 15,198,755
Fair Value, Measurements, Recurring    
Fair Value Quantiative Information [Line Items]    
Future policy benefits $ 8,480,030 $ 5,205,434
Level 3 | Minimum    
Fair Value Quantiative Information [Line Items]    
Fair Value Inputs, Policyholder Age 35 years  
Level 3 | Maximum    
Fair Value Quantiative Information [Line Items]    
Fair Value Inputs, Policyholder Age 90 years  
Level 3 | Discounted cash flow | Minimum | Future Policy Benefits    
Fair Value Quantiative Information [Line Items]    
Lapse rate 0.00% 0.00%
NPR spread 0.36% 0.06%
Utilization rate 52.00% 56.00%
Withdrawal rate (greater than maximum range for current year) 78.00% 74.00%
Mortality rate 0.00% 0.00%
Equity volatility curve 17.00% 17.00%
Level 3 | Discounted cash flow | Maximum | Future Policy Benefits    
Fair Value Quantiative Information [Line Items]    
Lapse rate 13.00% 14.00%
NPR spread 1.74% 1.76%
Utilization rate 96.00% 96.00%
Withdrawal rate (greater than maximum range for current year) 100.00% 100.00%
Mortality rate 14.00% 14.00%
Equity volatility curve 25.00% 28.00%
Level 3 | Fair Value, Measurements, Recurring    
Fair Value Quantiative Information [Line Items]    
Future policy benefits $ 8,480,030 $ 5,205,434
Level 3 | Fair Value, Measurements, Recurring | Internal    
Fair Value Quantiative Information [Line Items]    
Reinsurance recoverables - Living Benefits 8,478,986 4,600,193
Future policy benefits 8,480,030 5,205,434
Level 3 | Fair Value, Measurements, Recurring | Internal | No Lapse Guarantee    
Fair Value Quantiative Information [Line Items]    
Reinsurance recoverables - No Lapse Guarantee $ 532,154 $ 339,818
Corporate securities | Level 3 | Discounted cash flow | Minimum    
Fair Value Quantiative Information [Line Items]    
Discount rate 2.16% 5.76%
Corporate securities | Level 3 | Discounted cash flow | Maximum    
Fair Value Quantiative Information [Line Items]    
Discount rate 12.91% 17.95%
Corporate securities | Level 3 | Discounted cash flow | Weighted Average    
Fair Value Quantiative Information [Line Items]    
Discount rate 6.67% 8.35%
Corporate securities | Level 3 | Market comparables | Minimum    
Fair Value Quantiative Information [Line Items]    
EBITDA multiples 5.0 5.0
Corporate securities | Level 3 | Market comparables | Maximum    
Fair Value Quantiative Information [Line Items]    
EBITDA multiples 5.0 5.0
Corporate securities | Level 3 | Market comparables | Weighted Average    
Fair Value Quantiative Information [Line Items]    
EBITDA multiples 5.0 5.0
Corporate securities | Level 3 | Liquidation | Minimum    
Fair Value Quantiative Information [Line Items]    
Fair Value Inputs Liquidation Value 95.48%  
Corporate securities | Level 3 | Liquidation | Maximum    
Fair Value Quantiative Information [Line Items]    
Fair Value Inputs Liquidation Value 95.48%  
Corporate securities | Level 3 | Liquidation | Weighted Average    
Fair Value Quantiative Information [Line Items]    
Fair Value Inputs Liquidation Value 95.48%  
Corporate securities | Level 3 | Fair Value, Measurements, Recurring    
Fair Value Quantiative Information [Line Items]    
Corporate securities $ 107,460 $ 95,492
Corporate securities | Level 3 | Fair Value, Measurements, Recurring | Internal    
Fair Value Quantiative Information [Line Items]    
Corporate securities $ 48,147 $ 40,492
Reinsurance Recoverables | Level 3 | Discounted cash flow | Minimum | No Lapse Guarantee    
Fair Value Quantiative Information [Line Items]    
Lapse rate 0.00% 0.00%
NPR spread 0.36% 0.06%
Mortality rate 0.00% 0.00%
Premium Payment 0.65 1.00
Reinsurance Recoverables | Level 3 | Discounted cash flow | Maximum | No Lapse Guarantee    
Fair Value Quantiative Information [Line Items]    
Lapse rate 12.00% 12.00%
NPR spread 1.74% 1.76%
Mortality rate 31.00% 20.00%
Premium Payment 0.95 3.75