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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, 2015
Dec. 31, 2014
Fair Value Quantiative Information [Line Items]    
Fixed maturities, available-for-sale, at fair value (amortized cost, 2015: $2,433,626; 2014: $2,609,253) $ 2,524,272 $ 2,800,593
Level 3    
Fair Value Quantiative Information [Line Items]    
Reinsurance recoverables $ 3,012,653 $ 2,996,154
Minimum    
Fair Value Quantiative Information [Line Items]    
Discount rate 3.71% 3.55%
Lapse rate 0.00% 0.00%
NPR spread 0.06% 0.00%
Utilization rate 63.00% 63.00%
Withdrawal rate 74.00% 74.00%
Mortality rate 0.00% 0.00%
Equity volatility curve 17.00% 17.00%
Minimum | Level 3    
Fair Value Quantiative Information [Line Items]    
Fair Value Inputs, Policyholder Age 35 years  
Maximum    
Fair Value Quantiative Information [Line Items]    
Discount rate 17.95% 11.75%
Lapse rate 14.00% 14.00%
NPR spread 1.76% 1.30%
Utilization rate 95.00% 95.00%
Withdrawal rate 100.00% 100.00%
Mortality rate 14.00% 14.00%
Equity volatility curve 28.00% 28.00%
Maximum | Level 3    
Fair Value Quantiative Information [Line Items]    
Fair Value Inputs, Policyholder Age 90 years  
Weighted Average    
Fair Value Quantiative Information [Line Items]    
Discount rate 4.43% 3.96%
Equity securities | Level 3    
Fair Value Quantiative Information [Line Items]    
Fixed maturities, available-for-sale, at fair value (amortized cost, 2015: $2,433,626; 2014: $2,609,253) $ 111,295 $ 99,209
Future Policy Benefits | Level 3    
Fair Value Quantiative Information [Line Items]    
Future policy benefits $ 3,134,077 $ 3,112,411