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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, 2019 | Dec. 31, 2018
Credit Derivatives [Line Items] |  |  |  |  |
Document Period End Date |  | Jun. 30, 2019 |  |  |
Credit Derivative Current Fair Value | [1] | $ 6,056 |  | $ 4,837 |
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 1,331,300 |  | $ 1,338,300 |
Derivative Average Remaining Maturity | [1],[3] | 3 years 9 months 18 days |  | 4 years 8 months 12 days |
Standard Poors AAA To A Minus Ratings [Member] | Single Name Credit Default Swaps [Member] |  |  |  |  |
Credit Derivatives [Line Items] |  |  |  |  |
Credit Derivative Current Fair Value | [1] | $ 2,015 |  | $ 1,953 |
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 147,000 |  | $ 152,000 |
Derivative Average Remaining Maturity | [1],[3] | 2 years 1 month 6 days |  | 2 years 2 months 12 days |
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Subtotal [Member] |  |  |  |  |
Credit Derivatives [Line Items] |  |  |  |  |
Credit Derivative Current Fair Value | [1] | $ 2,015 |  | $ 1,953 |
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 147,000 |  | $ 152,000 |
Derivative Average Remaining Maturity | [1],[3] | 2 years 1 month 6 days |  | 2 years 2 months 12 days |
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member] |  |  |  |  |
Credit Derivatives [Line Items] |  |  |  |  |
Credit Derivative Current Fair Value | [1] | $ 3,762 |  | $ 2,930 |
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 321,700 |  | $ 353,700 |
Derivative Average Remaining Maturity | [1],[3] | 2 years |  | 2 years 2 months 12 days |
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member] |  |  |  |  |
Credit Derivatives [Line Items] |  |  |  |  |
Credit Derivative Current Fair Value | [1] | $ 288 |  | $ (76) |
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 852,600 |  | $ 817,600 |
Derivative Average Remaining Maturity | [1],[3] | 4 years 9 months 18 days |  | 6 years 4 months 24 days |
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member] |  |  |  |  |
Credit Derivatives [Line Items] |  |  |  |  |
Credit Derivative Current Fair Value | [1] | $ 4,050 |  | $ 2,854 |
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 1,174,300 |  | $ 1,171,300 |
Derivative Average Remaining Maturity | [1],[3] | 4 years 1 month 6 days |  | 5 years 1 month 6 days |
Standard & Poor's, BB Rating [Member] |  |  |  |  |
Credit Derivatives [Line Items] |  |  |  |  |
Derivative Average Remaining Maturity | [1] | 3 months 18 days | [3] | 8 months 12 days | [2]
Standard & Poor's, BB Rating [Member] | Single Name Credit Default Swaps [Member] |  |  |  |  |
Credit Derivatives [Line Items] |  |  |  |  |
Credit Derivative Current Fair Value | [1] | $ (9) |  | $ 30 |
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | 10,000 |  | 15,000 |
Standard & Poor's, BB Rating [Member] | Credit Default Subtotal [Member] |  |  |  |  |
Credit Derivatives [Line Items] |  |  |  |  |
Credit Derivative Current Fair Value | [1] | (9) |  | 30 |
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 10,000 |  | $ 15,000 |
[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 The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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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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- 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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