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Fair Value of Assets and Liabilities (Quantitative Info for Level 3 Inputs) (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Fair Value Quantiative Information [Line Items]    
Corporate securities $ 6,456,275 $ 6,194,564
Minimum    
Fair Value Quantiative Information [Line Items]    
Discount rate 10.12% 10.00%
EBITDA multiples 5 6.1
Lapse rate 0.00% 0.00%
NPR spread 0.00% 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 0.00% 0.00%
Mortality rate 0.00% 0.00%
Premium Payment 1 1
Maximum    
Fair Value Quantiative Information [Line Items]    
Discount rate 15.05% 11.75%
EBITDA multiples 6.5 6.1
Lapse rate 14.00% 14.00%
NPR spread 1.68% 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 1.68% 1.30%
Mortality rate 20.00% 18.00%
Premium Payment 3.75 3.75
Weighted Average    
Fair Value Quantiative Information [Line Items]    
Discount rate 10.92% 10.52%
EBITDA multiples 6.4 6.1
Level 3    
Fair Value Quantiative Information [Line Items]    
Reinsurance recoverables - Living Benefits $ 2,778,497 $ 4,521,928
Level 3 | No Lapse Guarantee    
Fair Value Quantiative Information [Line Items]    
Reinsurance recoverables - No Lapse Guarantee 244,622 375,617
Level 3 | Corporate securities    
Fair Value Quantiative Information [Line Items]    
Corporate securities 24,797 23,712
Level 3 | Future Policy Benefits    
Fair Value Quantiative Information [Line Items]    
Future policy benefits $ 3,117,171 $ 4,993,611
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