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Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ (1,992) | $ 8,187
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 902,000 | $ 805,700
Derivative Average Remaining Maturity | [1],[3] | 5 years 2 months | 4 years 11 months
Standard Poors AAA To A Minus Ratings [Member] | Single Name Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 1,827 | $ 1,498
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 180,000 | $ 167,500
Derivative Average Remaining Maturity | [1],[3] | 4 years 9 months | 4 years 7 months
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Swaps Referencing Indices [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 0 | $ 0
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | 0 | 0
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Subtotal [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | 1,827 | 1,498
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 180,000 | $ 167,500
Derivative Average Remaining Maturity | [1],[3] | 4 years 9 months | 4 years 7 months
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ (3,063) | $ 168
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 296,000 | $ 217,200
Derivative Average Remaining Maturity | [1],[3] | 5 years 4 months | 4 years 11 months
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 1,373 | $ 6,651
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 416,000 | $ 416,000
Derivative Average Remaining Maturity | [1],[3] | 5 years 2 months | 5 years
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ (1,690) | $ 6,819
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 712,000 | $ 633,200
Derivative Average Remaining Maturity | [1],[3] | 5 years 4 months | 4 years 11 months
Standard & Poor's, BB Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative Average Remaining Maturity | [1],[2] | 4 years 5 months | 4 years 6 months
Standard & Poor's, BB Rating [Member] | Single Name Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ (2,129) | $ (130)
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | 10,000 | 5,000
Standard & Poor's, BB Rating [Member] | Credit Default Swaps Referencing Indices [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | 0 | 0
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | 0 | 0
Standard & Poor's, BB Rating [Member] | Credit Default Subtotal [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | (2,129) | (130)
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 10,000 | $ 5,000
[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=56946850&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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of credit risk derivative asset after deduction of credit risk derivative liability. + 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=56946850&loc=SL5708775-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 3: 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=49121117&loc=d3e13433-108611 + Details
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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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