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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: $ 6,840,932 $ 6,194,564
Level 3    
Fair Value Quantiative Information [Line Items]    
Reinsurance recoverables - Living Benefits 4,600,193 4,521,928
Level 3 | No Lapse Guarantee    
Fair Value Quantiative Information [Line Items]    
Reinsurance recoverables - No Lapse Guarantee $ 339,818 $ 375,617
Minimum    
Fair Value Quantiative Information [Line Items]    
Discount rate 5.76% 10.00%
EBITDA Multiples 5.0 6.1
Lapse rate 0.00% 0.00%
NPR spread 0.06% 0.00%
Utilization rate 56.00% 63.00%
Withdrawal rate 74.00% 74.00%
Mortality rate 0.00% 0.00%
Equity volatility curve 17.00% 17.00%
Minimum | No Lapse Guarantee    
Fair Value Quantiative Information [Line Items]    
Lapse rate 0.00% 0.00%
NPR spread 0.06% 0.00%
Mortality rate 0.00% 0.00%
Premium Payment 1.00 1.00
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%
EBITDA Multiples 5.0 6.1
Lapse rate 14.00% 14.00%
NPR spread 1.76% 1.30%
Utilization rate 96.00% 96.00%
Withdrawal rate 100.00% 100.00%
Mortality rate 14.00% 14.00%
Equity volatility curve 28.00% 28.00%
Maximum | No Lapse Guarantee    
Fair Value Quantiative Information [Line Items]    
Lapse rate 12.00% 15.00%
NPR spread 1.76% 1.30%
Mortality rate 20.00% 18.00%
Premium Payment 3.75 3.75
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 8.35% 10.52%
EBITDA Multiples 5.0 6.1
Corporate securities | Level 3    
Fair Value Quantiative Information [Line Items]    
Fixed maturities, available-for-sale: $ 40,492 $ 23,712
Future Policy Benefits | Level 3    
Fair Value Quantiative Information [Line Items]    
Future policy benefits $ 5,205,434 $ 4,993,611