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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 | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Percentage Of Fixed Maturity Securities Classified As Level 3 | 6.20% | 6.90%
Corporate Debt Securities [Member] | Market Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | $ 158,309 | $ 167,815
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 | $ 33,349 | $ 26,958
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] | 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 | $ 4,607 | $ 4,670
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 | $ 812,718 | $ 805,672
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 | 9.00% | 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%
Fair Value Inputs Option Budget Projection | 2.00% | 2.00%
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 | $ 161,913 | $ 184,636
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 | 6.00% | 6.00%
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 | 9.00% | 14.00%
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 | $ 1,552 | $ 2,462
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 | $ 61,281 | $ (22,529)
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 | 9.00% | 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%
Fair Value Inputs, Entity Credit Risk | 1.00% | 1.00%
Fair Value Inputs Credit Rate | 2.00% | 2.00%
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%
Total Return Swap [Member] | US Government Agencies Debt Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | $ 23,567 | $ 24,488

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