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Fair Value of Assets and Liabilities (Quantitative Info for Level 3 Inputs) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Measurements, Recurring    
Fair Value Quantiative Information [Line Items]    
Future policy benefits $ 5,452,583 $ 5,041,007
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 | Fair Value, Measurements, Recurring    
Fair Value Quantiative Information [Line Items]    
Future policy benefits $ 5,452,583 $ 5,041,007
Level 3 | Internal | Minimum | Discounted cash flow | Future Policy Benefits    
Fair Value Quantiative Information [Line Items]    
Lapse rate 1.00% 0.00%
Spread over LIBOR 0.12% 0.25%
Utilization rate 52.00% 52.00%
Withdrawal rate (greater than maximum range) 78.00% 78.00%
Mortality rate 0.00% 0.00%
Equity volatility curve 13.00% 16.00%
Level 3 | Internal | Minimum | Discounted cash flow | Corporate securities    
Fair Value Quantiative Information [Line Items]    
Discount rate 5.06% 4.54%
Level 3 | Internal | Minimum | Discounted cash flow | Reinsurance Recoverables | No Lapse Guarantee    
Fair Value Quantiative Information [Line Items]    
Lapse rate   0.00%
Spread over LIBOR   0.25%
Mortality rate   0.00%
Premium Payment   0.65
Level 3 | Internal | Minimum | Market comparables | Corporate securities    
Fair Value Quantiative Information [Line Items]    
EBITDA Multiples   4.0
Level 3 | Internal | Minimum | Liquidation | Corporate securities    
Fair Value Quantiative Information [Line Items]    
Liquidation value 25.00% 98.21%
Level 3 | Internal | Maximum | Discounted cash flow | Future Policy Benefits    
Fair Value Quantiative Information [Line Items]    
Lapse rate 12.00% 13.00%
Spread over LIBOR 1.10% 1.50%
Utilization rate 97.00% 96.00%
Withdrawal rate (greater than maximum range) 100.00% 100.00%
Mortality rate 14.00% 14.00%
Equity volatility curve 24.00% 25.00%
Level 3 | Internal | Maximum | Discounted cash flow | Corporate securities    
Fair Value Quantiative Information [Line Items]    
Discount rate 22.23% 15.00%
Level 3 | Internal | Maximum | Discounted cash flow | Reinsurance Recoverables | No Lapse Guarantee    
Fair Value Quantiative Information [Line Items]    
Lapse rate   12.00%
Spread over LIBOR   1.50%
Mortality rate   31.00%
Premium Payment   0.95
Level 3 | Internal | Maximum | Market comparables | Corporate securities    
Fair Value Quantiative Information [Line Items]    
EBITDA Multiples   4.0
Level 3 | Internal | Maximum | Liquidation | Corporate securities    
Fair Value Quantiative Information [Line Items]    
Liquidation value 25.00% 98.21%
Level 3 | Internal | Weighted Average | Discounted cash flow | Corporate securities    
Fair Value Quantiative Information [Line Items]    
Discount rate 7.33% 8.06%
Level 3 | Internal | Weighted Average | Market comparables | Corporate securities    
Fair Value Quantiative Information [Line Items]    
EBITDA Multiples   4.0
Level 3 | Internal | Weighted Average | Liquidation | Corporate securities    
Fair Value Quantiative Information [Line Items]    
Liquidation value 25.00% 98.21%
Level 3 | Internal | Fair Value, Measurements, Recurring    
Fair Value Quantiative Information [Line Items]    
Reinsurance recoverables $ 5,457,649 $ 5,041,262
Level 3 | Internal | Fair Value, Measurements, Recurring | No Lapse Guarantee    
Fair Value Quantiative Information [Line Items]    
Reinsurance recoverables - No Lapse Guarantee   433,001
Level 3 | Internal | Fair Value, Measurements, Recurring | Future Policy Benefits    
Fair Value Quantiative Information [Line Items]    
Future policy benefits 5,452,583 5,041,007
Level 3 | Internal | Fair Value, Measurements, Recurring | Corporate securities    
Fair Value Quantiative Information [Line Items]    
Corporate securities $ 36,966 $ 45,715