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Fair Value Disclosures (Details 1) (USD $) | Mar. 31, 2013 | Dec. 31, 2012
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Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities | 769,685,000 |
Interest-sensitive contract liabilities - embedded derivatives - variable annuities | 120,791,000 |
Discounted Cash Flow [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities |  | 740,256,000
Interest-sensitive contract liabilities - embedded derivatives - variable annuities |  | 172,105,000
Discounted Cash Flow [Member] | Mortality [Member] | Minimum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range | 0.00% | 0.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 0.00% | 0.00%
Discounted Cash Flow [Member] | Mortality [Member] | Maximum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range | 100.00% | 100.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 100.00% | 100.00%
Discounted Cash Flow [Member] | Mortality [Member] | Weighted Average [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range | 1.00% | 1.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 2.00% | 2.00%
Discounted Cash Flow [Member] | Lapse [Member] | Minimum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range | 0.00% | 0.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 0.00% | 0.00%
Discounted Cash Flow [Member] | Lapse [Member] | Maximum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range | 35.00% | 35.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 25.00% | 25.00%
Discounted Cash Flow [Member] | Lapse [Member] | Weighted Average [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range | 6.00% | 6.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 5.00% | 5.00%
Discounted Cash Flow [Member] | Withdrawal [Member] | Minimum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range | 0.00% | 0.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 0.00% | 0.00%
Discounted Cash Flow [Member] | Withdrawal [Member] | Maximum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range | 5.00% | 5.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 7.00% | 7.00%
Discounted Cash Flow [Member] | Withdrawal [Member] | Weighted Average [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range | 3.00% | 3.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 3.00% | 3.00%
Discounted Cash Flow [Member] | Own Credit [Member] | Minimum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 0.00% | 0.00%
Discounted Cash Flow [Member] | Own Credit [Member] | Maximum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 1.00% | 1.00%
Discounted Cash Flow [Member] | Own Credit [Member] | Weighted Average [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 1.00% | 1.00%
Discounted Cash Flow [Member] | Option Budget Projection [Member] | Minimum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range | 2.00% | 2.00%
Discounted Cash Flow [Member] | Option Budget Projection [Member] | Maximum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range | 4.00% | 4.00%
Discounted Cash Flow [Member] | Option Budget Projection [Member] | Weighted Average [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range | 3.00% | 3.00%
Discounted Cash Flow [Member] | Long Term Volatility [Member] | Minimum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 0.00% | 0.00%
Discounted Cash Flow [Member] | Long Term Volatility [Member] | Maximum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 27.00% | 27.00%
Discounted Cash Flow [Member] | Long Term Volatility [Member] | Weighted Average [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range | 13.00% | 14.00%
Total Return Swap [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives | (156,189,000) | (243,177,000)
Total Return Swap [Member] | Mortality [Member] | Minimum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 0.00% | 0.00%
Total Return Swap [Member] | Mortality [Member] | Maximum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 100.00% | 100.00%
Total Return Swap [Member] | Mortality [Member] | Weighted Average [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 1.00% | 1.00%
Total Return Swap [Member] | Lapse [Member] | Minimum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 0.00% | 0.00%
Total Return Swap [Member] | Lapse [Member] | Maximum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 35.00% | 35.00%
Total Return Swap [Member] | Lapse [Member] | Weighted Average [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 4.00% | 6.00%
Total Return Swap [Member] | Withdrawal [Member] | Minimum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 0.00% | 0.00%
Total Return Swap [Member] | Withdrawal [Member] | Maximum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 5.00% | 5.00%
Total Return Swap [Member] | Withdrawal [Member] | Weighted Average [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 4.00% | 3.00%
Total Return Swap [Member] | Own Credit [Member] | Minimum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 0.00% | 0.00%
Total Return Swap [Member] | Own Credit [Member] | Maximum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 1.00% | 1.00%
Total Return Swap [Member] | Own Credit [Member] | Weighted Average [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 1.00% | 1.00%
Total Return Swap [Member] | Crediting Rate [Member] | Minimum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 2.00% | 2.00%
Total Return Swap [Member] | Crediting Rate [Member] | Maximum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 4.00% | 4.00%
Total Return Swap [Member] | Crediting Rate [Member] | Weighted Average [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
Funds withheld at interest - embedded derivatives Unobservable Input Range | 3.00% | 3.00%
Market Comparable Securities [Member] | Liquidity Premium [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
State And Political Subdivision Securities | 5,364,000 | 5,451,000
Corporate Securities | 429,817,000 | 450,177,000
Short-term Investments | 22,001,000 | 22,031,000
Market Comparable Securities [Member] | Liquidity Premium [Member] | Minimum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
State And Political Subdivision Securities Unobservable Input Range | 1.00% | 1.00%
Corporate Securities Unobservable Input Range | 0.00% | 0.00%
Short Term Investments Unobservable Input Range | 1.00% | 1.00%
Market Comparable Securities [Member] | Liquidity Premium [Member] | Maximum [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
State And Political Subdivision Securities Unobservable Input Range | 1.00% | 1.00%
Corporate Securities Unobservable Input Range | 2.00% | 2.00%
Short Term Investments Unobservable Input Range | 1.00% | 1.00%
Market Comparable Securities [Member] | Liquidity Premium [Member] | Weighted Average [Member] |  |
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items] |  |
State And Political Subdivision Securities Unobservable Input Range | 1.00% | 1.00%
Corporate Securities Unobservable Input Range | 1.00% | 1.00%
Short Term Investments Unobservable Input Range | 1.00% | 1.00%

X
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- Definition The percentage range that represents the amount of securities secured by corporate securities. + References No definition available. + Details
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- Definition Embedded derivatives related to funds held by the ceding insurer on behalf the reinsurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder, which represent an asset for the reinsurer. There is another concept for the corresponding liability of the ceding insurer. + References No definition available. + Details
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- Definition Embedded derivatives related to funds held by the ceding insurer on behalf the reinsurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder, which represent an asset for the reinsurer. There is another concept for the corresponding liability of the ceding insurer. Value represents the percentage range and weighted average. + References No definition available. + Details
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- Definition Fair Value, Liabilities Measured on Recurring Basis, Interest-sensitive contract liabilities - embedded derivatives - indexed annuities. + References No definition available. + Details
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- Definition Fair Value, Liabilities Measured on Recurring Basis, Interest-sensitive contract liabilities - embedded derivatives - indexed annuities. Value represents the percentage range and weighted average value. + References No definition available. + Details
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- Definition Fair Value, Liabilities Measured on Recurring Basis, Interest-sensitive contract liabilities - embedded derivatives - variable annuities. + References No definition available. + Details
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- Definition Fair Value, Liabilities Measured on Recurring Basis, Interest-sensitive contract liabilities - embedded derivatives - variable annuities. Value Represents the percentage range and weighted average value. + References No definition available. + Details
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- Definition The percentage range that represents the amount of securities secured by short term investments. + References No definition available. + Details
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- Definition The balance represents the amount of securities secured by state and political subdivision securities. + References No definition available. + Details
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Balance Type: | debit
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- Definition The range of unobservable input percentages that represent the amount of securities secured by state and political subdivision securities. + References No definition available. + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 1 -Subparagraph g Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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