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Fair Value of Assets and Liabilities (Quantitative Info for Level 3 Inputs) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Fair Value Quantiative Information [Line Items]    
Fair Value $ 2,533,299 $ 2,800,593
Minimum    
Fair Value Quantiative Information [Line Items]    
Discount rate 3.32% 3.55%
Lapse rate 0.00% 0.00%
NPR spread 0.00% 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%
Maximum    
Fair Value Quantiative Information [Line Items]    
Discount rate 15.05% 11.75%
Lapse rate 14.00% 14.00%
NPR spread 1.68% 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%
Weighted Average    
Fair Value Quantiative Information [Line Items]    
Discount rate 3.77% 3.96%
Level 3    
Fair Value Quantiative Information [Line Items]    
Reinsurance recoverables $ 2,213,966 $ 2,996,154
Fair Value $ 2,300,419 3,112,411
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 | Corporate securities    
Fair Value Quantiative Information [Line Items]    
Fair Value $ 102,483 99,209
Level 3 | Future policy benefits    
Fair Value Quantiative Information [Line Items]    
Fair Value $ 2,300,419 $ 3,112,411