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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, 2017 | Dec. 31, 2016
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 7,261 | $ 8,970
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 944,700 | $ 922,700
Derivative Average Remaining Maturity | [1],[3] | 3 years 7 months | 4 years 3 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] | $ 2,975 | $ 1,726
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 155,500 | $ 150,500
Derivative Average Remaining Maturity | [1],[3] | 3 years 2 months | 3 years 10 months
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Subtotal [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 2,975 | $ 1,726
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 155,500 | $ 150,500
Derivative Average Remaining Maturity | [1],[3] | 3 years 2 months | 3 years 10 months
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 4,209 | $ 1,426
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 368,200 | $ 347,200
Derivative Average Remaining Maturity | [1],[3] | 3 years 2 months | 3 years 8 months
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 56 | $ 6,295
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 416,000 | $ 416,000
Derivative Average Remaining Maturity | [1],[3] | 4 years 2 months | 5 years
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 4,265 | $ 7,721
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 784,200 | $ 763,200
Derivative Average Remaining Maturity | [1],[3] | 3 years 8 months | 4 years 5 months
Standard & Poor's, BB Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative Average Remaining Maturity | [1],[2] | 1 year 8 months | 3 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] | $ 21 | $ (477)
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | 5,000 | 9,000
Standard & Poor's, BB Rating [Member] | Credit Default Subtotal [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | 21 | (477)
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 5,000 | $ 9,000
[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=84234895&loc=SL5708775-113959 + 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=84234895&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=77997519&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=77997519&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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- Details
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