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Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 6,603 | $ 7,572
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 928,300 | $ 951,300
Derivative Average Remaining Maturity | [1],[3] | 3 years | 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] | $ 2,574 | $ 3,128
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 152,000 | $ 162,000
Derivative Average Remaining Maturity | [1],[3] | 2 years 8 months | 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] | $ 2,574 | $ 3,128
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 152,000 | $ 162,000
Derivative Average Remaining Maturity | [1],[3] | 2 years 8 months | 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] | $ 4,092 | $ 4,469
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 338,700 | $ 361,700
Derivative Average Remaining Maturity | [1],[3] | 2 years 7 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] | $ (59) | $ (55)
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 422,600 | $ 422,600
Derivative Average Remaining Maturity | [1],[3] | 3 years 6 months | 4 years
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 4,033 | $ 4,414
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 761,300 | $ 784,300
Derivative Average Remaining Maturity | [1],[3] | 3 years 1 month | 3 years 6 months
Standard & Poor's, BB Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative Average Remaining Maturity | [1],[2] | 1 year 2 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] | $ (4) | $ 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] | (4) | 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5708775-113959 + Details
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Balance Type: | credit
Period Type: | instant

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4K -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5708775-113959 + 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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