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Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | $ 2,122 | [1] | $ (3,707) | [1]
Maximum Potential Future Exposure on Credit Risk Derivatives | 671,700 | [1],[2] | 696,000 | [1],[2]
Derivative Average Remaining Maturity | 4 years 7 months 6 days | [1],[3] | 5 years 2 months 12 days | [1],[3]
Standard Poors AAA To A Minus Ratings [Member] | Single Name Credit Default Swaps [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | (80) | [1] | (2,077) | [1]
Maximum Potential Future Exposure on Credit Risk Derivatives | 112,500 | [1],[2] | 124,500 | [1],[2]
Derivative Average Remaining Maturity | 5 years 2 months 12 days | [1],[3] | 5 years 10 months 24 days | [1],[3]
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Swaps Referencing Indices [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | 0 | [1] | 0 | [1]
Maximum Potential Future Exposure on Credit Risk Derivatives | 0 | [1],[2] | 0 | [1],[2]
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Subtotal [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | (80) | [1] | (2,077) | [1]
Maximum Potential Future Exposure on Credit Risk Derivatives | 112,500 | [1],[2] | 124,500 | [1],[2]
Derivative Average Remaining Maturity | 5 years 2 months 12 days | [1],[3] | 5 years 10 months 24 days | [1],[3]
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | (1,734) | [1] | (2,345) | [1]
Maximum Potential Future Exposure on Credit Risk Derivatives | 144,200 | [1],[2] | 135,500 | [1],[2]
Derivative Average Remaining Maturity | 5 years | [1],[3] | 5 years 6 months | [1],[3]
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | 3,936 | [1] | 937 | [1]
Maximum Potential Future Exposure on Credit Risk Derivatives | 415,000 | [1],[2] | 430,000 | [1],[2]
Derivative Average Remaining Maturity | 4 years 2 months 12 days | [1],[3] | 5 years | [1],[3]
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | 2,202 | [1] | (1,408) | [1]
Maximum Potential Future Exposure on Credit Risk Derivatives | 559,200 | [1],[2] | 565,500 | [1],[2]
Derivative Average Remaining Maturity | 4 years 4 months 24 days | [1],[3] | 5 years 1 month 6 days | [1],[3]
Standard Poors BB Rating [Member] | Single Name Credit Default Swaps [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | 0 | [1] | (222) | [1]
Maximum Potential Future Exposure on Credit Risk Derivatives | 0 | [1],[2] | 6,000 | [1],[2]
Derivative Average Remaining Maturity |  |  | 4 years 6 months | [1],[3]
Standard Poors BB Rating [Member] | Credit Default Swaps Referencing Indices [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | 0 | [1] | 0 | [1]
Maximum Potential Future Exposure on Credit Risk Derivatives | 0 | [1],[2] | 0 | [1],[2]
Standard Poors BB Rating [Member] | Credit Default Subtotal [Member] |  |  |  |
Credit Derivatives [Line Items] |  |  |  |
Credit Derivative Current Fair Value | 0 | [1] | (222) | [1]
Maximum Potential Future Exposure on Credit Risk Derivatives | $ 0 | [1],[2] | $ 6,000 | [1],[2]
Derivative Average Remaining Maturity |  |  | 4 years 6 months | [1],[3]
[1] | The rating agency designations are based on ratings from Standard and Poor’s (“S&P”).
[2] | Assumes the value of the referenced credit obligations is zero.
[3] | The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.

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- Definition Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5708775-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Credit Derivative -URI http://asc.fasb.org/extlink&oid=6854095 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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- Definition Fair value of credit risk derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: 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=7476318&loc=SL5708775-113959 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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