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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Quantitative Information for Level 3 Inputs) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Percentage Of Fixed Maturity Securities Classified As Level 3 8.70% 8.80%
Corporate Debt Securities [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure $ 186,499 $ 205,392
Corporate Debt Securities [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount for Lack of Marketability 1.00% 1.00%
Corporate Debt Securities [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount for Lack of Marketability 2.00% 2.00%
Corporate Debt Securities [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount for Lack of Marketability 0.00% 0.00%
Longevity Swap [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure $ 13,298 $ 7,727
Longevity Swap [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 2.00% 2.00%
Fair Value Inputs Mortality Improvement 3.00% 3.00%
Longevity Swap [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 100.00% 100.00%
Fair Value Inputs Mortality Improvement 10.00% 10.00%
Longevity Swap [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 0.00% 0.00%
Fair Value Inputs Mortality Improvement (10.00%) (10.00%)
US Government Agencies Debt Securities [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure $ 27,320 $ 28,530
US Government Agencies Debt Securities [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount for Lack of Marketability 1.00% 1.00%
US Government Agencies Debt Securities [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount for Lack of Marketability 1.00% 1.00%
US Government Agencies Debt Securities [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount for Lack of Marketability 0.00% 0.00%
US States and Political Subdivisions Debt Securities [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure $ 4,898 $ 4,994
US States and Political Subdivisions Debt Securities [Member] | Weighted Average [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount for Lack of Marketability 1.00% 1.00%
US States and Political Subdivisions Debt Securities [Member] | Maximum [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount for Lack of Marketability 1.00% 1.00%
US States and Political Subdivisions Debt Securities [Member] | Minimum [Member] | Market Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Discount for Lack of Marketability 1.00% 1.00%
Embedded Derivatives In Indexed Annuity [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 877,503 $ 925,887
Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End 6.00% 7.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 2.00% 2.00%
Fair Value Inputs Withdrawal 3.00% 3.00%
Fair Value Inputs Option Budget Projection 3.00% 3.00%
Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End 35.00% 35.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 100.00% 100.00%
Fair Value Inputs Withdrawal 5.00% 5.00%
Fair Value Inputs Option Budget Projection 4.00% 4.00%
Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End 0.00% 0.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 0.00% 0.00%
Fair Value Inputs Withdrawal 0.00% 0.00%
Fair Value Inputs Option Budget Projection 2.00% 2.00%
Embedded Derivatives In Variable Annuity [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 228,907 $ 159,279
Embedded Derivatives In Variable Annuity [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End 8.00% 8.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 2.00% 2.00%
Fair Value Inputs Withdrawal 3.00% 3.00%
Embedded Derivatives In Variable Annuity [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End 25.00% 25.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 100.00% 100.00%
Fair Value Inputs Withdrawal 7.00% 7.00%
Embedded Derivatives In Variable Annuity [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End 0.00% 0.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 0.00% 0.00%
Fair Value Inputs Withdrawal 0.00% 0.00%
Embedded Derivatives In Variable Annuity Contracts [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Entity Credit Risk 1.00% 1.00%
Fair Value Assumptions, Expected Volatility Rate 14.00% 11.00%
Embedded Derivatives In Variable Annuity Contracts [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Entity Credit Risk 5.00% 5.00%
Fair Value Assumptions, Expected Volatility Rate 27.00% 27.00%
Embedded Derivatives In Variable Annuity Contracts [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Inputs, Entity Credit Risk 0.00% 0.00%
Fair Value Assumptions, Expected Volatility Rate 0.00% 0.00%
Mortality Swap [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 2,196 $ 797
Mortality Swap [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 1.00% 1.00%
Mortality Swap [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 100.00% 100.00%
Mortality Swap [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 0.00% 0.00%
Total Return Swap [Member] | Funds Withheld At Interest Embedded Derivatives [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure $ 49,498 $ 22,094
Total Return Swap [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End 6.00% 7.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 2.00% 2.00%
Fair Value Inputs Withdrawal 3.00%  
Fair Value Inputs, Entity Credit Risk 1.00% 1.00%
Fair Value Inputs Credit Rate 3.00% 3.00%
Total Return Swap [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End 35.00% 35.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 100.00% 100.00%
Fair Value Inputs Withdrawal 5.00% 5.00%
Fair Value Inputs, Entity Credit Risk 5.00% 5.00%
Fair Value Inputs Credit Rate 4.00% 4.00%
Total Return Swap [Member] | Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End 0.00% 0.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End 0.00% 0.00%
Fair Value Inputs Withdrawal 0.00% 0.00%
Fair Value Inputs, Entity Credit Risk 0.00% 0.00%
Fair Value Inputs Credit Rate 2.00% 2.00%