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Fair Value of Assets and Liabilities (Quantitative Information for Level 3 Inputs) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
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 | $ 167,815 | $ 195,557
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%
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] | 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] | Market Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | $ 24,488 | $ 26,265
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%
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] | 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] | Market Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | $ 4,670 | $ 4,770
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 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] | 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%
Funds Withheld At Interest Embedded Derivatives [Member] | Total Return Swap [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | $ 22,529 | $ (76,698)
Funds Withheld At Interest Embedded Derivatives [Member] | Minimum [Member] | Total Return Swap [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Inputs, Entity Credit Risk | 0.00% | 0.00%
Fair Value Inputs Withdrawal | 0.00% | 0.00%
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 Credit Rate | 2.00% | 2.00%
Funds Withheld At Interest Embedded Derivatives [Member] | Maximum [Member] | Total Return Swap [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Inputs, Entity Credit Risk | 5.00% | 5.00%
Fair Value Inputs Withdrawal | 5.00% | 5.00%
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 Credit Rate | 4.00% | 4.00%
Funds Withheld At Interest Embedded Derivatives [Member] | Weighted Average [Member] | Total Return Swap [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Inputs, Entity Credit Risk | 1.00% | 1.00%
Fair Value Inputs Withdrawal | 3.00% | 3.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End | 8.00% | 7.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End | 2.00% | 2.00%
Fair Value Inputs Credit Rate | 2.00% | 3.00%
Longevity Swap [Member] | Income Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Disclosure | $ 26,958 | $ 14,996
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%)
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] | 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%
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 | $ 805,672 | $ 878,114
Embedded Derivatives In Indexed Annuity [Member] | Minimum [Member] | Income Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Inputs Option Budget Projection | 2.00% | 2.00%
Fair Value Inputs Withdrawal | 0.00% | 0.00%
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%
Embedded Derivatives In Indexed Annuity [Member] | Maximum [Member] | Income Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Inputs Option Budget Projection | 4.00% | 4.00%
Fair Value Inputs Withdrawal | 5.00% | 5.00%
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%
Embedded Derivatives In Indexed Annuity [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Inputs Option Budget Projection | 2.00% | 3.00%
Fair Value Inputs Withdrawal | 3.00% | 3.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End | 8.00% | 7.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End | 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 | $ 184,636 | $ 192,470
Embedded Derivatives In Variable Annuity [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 Inputs Withdrawal | 0.00% | 0.00%
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%
Embedded Derivatives In Variable Annuity [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 Inputs Withdrawal | 7.00% | 7.00%
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%
Embedded Derivatives In Variable Annuity [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 Inputs Withdrawal | 3.00% | 3.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Lapse Rate, Low End | 6.00% | 8.00%
Long-Duration Contracts, Assumptions by Product and Guarantee, Mortality Rate, Low End | 2.00% | 2.00%
Mortality Swap [Member] | Income Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 2,462 | $ 2,619
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%
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] | 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%
Embedded Derivatives In Variable Annuity Contracts [Member] | Minimum [Member] | Income Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Assumptions, Expected Volatility Rate | 0.00% | 0.00%
Embedded Derivatives In Variable Annuity Contracts [Member] | Maximum [Member] | Income Approach Valuation Technique [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Assumptions, Expected Volatility Rate | 27.00% | 27.00%
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 Assumptions, Expected Volatility Rate | 14.00% | 14.00%

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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