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Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 7,095 | $ 7,572
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 923,300 | $ 951,300
Derivative Average Remaining Maturity | [1],[3] | 3 years 2 months | 3 years 5 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] | $ 2,761 | $ 3,128
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 152,000 | $ 162,000
Derivative Average Remaining Maturity | [1],[3] | 3 years | 2 years 11 months
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Subtotal [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 2,761 | $ 3,128
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 152,000 | $ 162,000
Derivative Average Remaining Maturity | [1],[3] | 3 years | 2 years 11 months
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 4,203 | $ 4,469
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 333,700 | $ 361,700
Derivative Average Remaining Maturity | [1],[3] | 2 years 9 months | 2 years 11 months
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 156 | $ (55)
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 422,600 | $ 422,600
Derivative Average Remaining Maturity | [1],[3] | 3 years 8 months | 4 years
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 4,359 | $ 4,414
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 756,300 | $ 784,300
Derivative Average Remaining Maturity | [1],[3] | 3 years 3 months | 3 years 6 months
Standard & Poor's, BB Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative Average Remaining Maturity | [1],[2] | 1 year 6 months | 1 year 6 months
Standard & Poor's, BB Rating [Member] | Single Name Credit Default Swaps [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ (25) | $ 30
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | 15,000 | 5,000
Standard & Poor's, BB Rating [Member] | Credit Default Subtotal [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | (25) | 30
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 15,000 | $ 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=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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