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Fair Value of Assets and Liabilities (Quantitative Info for Level 3 Inputs) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Measurements, Recurring    
Fair Value Quantiative Information [Line Items]    
Future policy benefits $ 7,098,647 $ 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 | Corporate securities    
Fair Value Quantiative Information [Line Items]    
Discount rate 5.29% 5.76%
Level 3 | Discounted cash flow | Minimum | Future Policy Benefits    
Fair Value Quantiative Information [Line Items]    
Lapse rate 0.00% 0.00%
NPR spread 0.44% 0.06%
Utilization rate 56.00% 56.00%
Withdrawal rate 74.00% 74.00%
Mortality rate 0.00% 0.00%
Equity volatility curve 16.00% 17.00%
Level 3 | Discounted cash flow | Maximum | Corporate securities    
Fair Value Quantiative Information [Line Items]    
Discount rate 20.38% 17.95%
Level 3 | Discounted cash flow | Maximum | Future Policy Benefits    
Fair Value Quantiative Information [Line Items]    
Lapse rate 14.00% 14.00%
NPR spread 2.07% 1.76%
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%
Level 3 | Discounted cash flow | Weighted Average | Corporate securities    
Fair Value Quantiative Information [Line Items]    
Discount rate 9.90% 8.35%
Level 3 | Market comparables | Minimum | Corporate securities    
Fair Value Quantiative Information [Line Items]    
EBITDA multiples 5.0 5.0
Level 3 | Market comparables | Maximum | Corporate securities    
Fair Value Quantiative Information [Line Items]    
EBITDA multiples 5.0 5.0
Level 3 | Market comparables | Weighted Average | Corporate securities    
Fair Value Quantiative Information [Line Items]    
EBITDA multiples 5.0 5.0
Level 3 | Fair Value, Measurements, Recurring    
Fair Value Quantiative Information [Line Items]    
Future policy benefits $ 7,098,647 $ 5,205,434
Level 3 | Fair Value, Measurements, Recurring | Internal    
Fair Value Quantiative Information [Line Items]    
Reinsurance recoverables - Living Benefits 6,348,158 4,600,193
Future policy benefits 7,098,647 5,205,434
Level 3 | Fair Value, Measurements, Recurring | Internal | No Lapse Guarantee    
Fair Value Quantiative Information [Line Items]    
Reinsurance recoverables - No Lapse Guarantee 393,579 339,818
Corporate securities | Level 3 | Fair Value, Measurements, Recurring    
Fair Value Quantiative Information [Line Items]    
Corporate securities 98,449 95,492
Corporate securities | Level 3 | Fair Value, Measurements, Recurring | Internal    
Fair Value Quantiative Information [Line Items]    
Corporate securities $ 43,449 $ 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 0.44% 0.06%
Mortality rate 0.00% 0.00%
Premium Payment 1.00 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 2.07% 1.76%
Mortality rate 20.00% 20.00%
Premium Payment 3.75 3.75