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Derivative Instruments (Details 5) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Credit Derivatives [Line Items] |  |
CreditDerivativeCurrentFairValue | $ (3,707,000) | $ (9,936,000)
DerivativeAverageRemainingMaturity | 5.2 | 5.2
Credit Default Subtotal [Member] |  |
Credit Derivatives [Line Items] |  |
Maximum Potential Future Exposure on Credit Risk Derivatives | 696,000,000 | 614,000,000
Standard Poors AAA To A Ratings [Member] | Single Name Credit Default Swaps [Member] |  |
Credit Derivatives [Line Items] |  |
CreditDerivativeCurrentFairValue | (2,077,000) | (1,774,000)
Maximum Potential Future Exposure on Credit Risk Derivatives | 124,500,000 | 85,000,000
DerivativeAverageRemainingMaturity | 5.9 | 5.5
Standard Poors AAA To A Ratings [Member] | Credit Default Subtotal [Member] |  |
Credit Derivatives [Line Items] |  |
CreditDerivativeCurrentFairValue | (2,077,000) | (1,774,000)
Maximum Potential Future Exposure on Credit Risk Derivatives | 124,500,000 | 85,000,000
DerivativeAverageRemainingMaturity | 5.9 | 5.5
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member] |  |
Credit Derivatives [Line Items] |  |
CreditDerivativeCurrentFairValue | (2,345,000) | (4,267,000)
Maximum Potential Future Exposure on Credit Risk Derivatives | 135,500,000 | 114,000,000
DerivativeAverageRemainingMaturity | 5.5 | 5.6
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member] |  |
Credit Derivatives [Line Items] |  |
CreditDerivativeCurrentFairValue | 937,000 | (3,895,000)
Maximum Potential Future Exposure on Credit Risk Derivatives | 430,000,000 | 415,000,000
DerivativeAverageRemainingMaturity | 5.0 | 5.0
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member] |  |
Credit Derivatives [Line Items] |  |
CreditDerivativeCurrentFairValue | (1,408,000) | (8,162,000)
Maximum Potential Future Exposure on Credit Risk Derivatives | 565,500,000 | 529,000,000
DerivativeAverageRemainingMaturity | 5.1 | 5.1
Standard Poors BB Rating [Member] | Single Name Credit Default Swaps [Member] |  |
Credit Derivatives [Line Items] |  |
CreditDerivativeCurrentFairValue | (222,000) | 0
Maximum Potential Future Exposure on Credit Risk Derivatives | 6,000,000 | 0
DerivativeAverageRemainingMaturity | 4.5 | --
Standard Poors BB Rating [Member] | Credit Default Subtotal [Member] |  |
Credit Derivatives [Line Items] |  |
CreditDerivativeCurrentFairValue | (222,000) | 0
Maximum Potential Future Exposure on Credit Risk Derivatives | $ 6,000,000 | $ 0
DerivativeAverageRemainingMaturity | 4.5 | --

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- Definition Discloses the fair value of the credit derivative (or each group of similar credit derivatives) as of the date of the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5708775-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44DD -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Period Type: | duration

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- Definition The average time remaining until maturity on the group of derivatives identified. + References No definition available. + Details
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- Definition Maximum amount the entity would be obligated to pay on the credit risk derivatives upon occurrence of a credit event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15A, 15B, 15C, 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5708775-113959 + Details
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