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Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 8,970 | $ (4,003)
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 922,700 | $ 893,700
Derivative Average Remaining Maturity | [1],[3] | 4 years 3 months | 4 years 6 months
Standard Poors AAA To A Ratings [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 1,726 | $ 1,689
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 150,500 | $ 152,500
Derivative Average Remaining Maturity | [1],[3] | 3 years 10 months | 3 years 11 months
Standard & Poor's, BBB Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 7,721 | $ (2,792)
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 763,200 | $ 731,200
Derivative Average Remaining Maturity | [1],[3] | 4 years 5 months | 4 years 7 months
Standard & Poor's, BB+ Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ (477) | $ (2,900)
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 9,000 | $ 10,000
Derivative Average Remaining Maturity | [1],[3] | 3 years 6 months | 4 years 1 month
Single Name Credit Default Swaps [Member] | Standard Poors AAA To A Ratings [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 1,726 | $ 1,689
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 150,500 | $ 152,500
Derivative Average Remaining Maturity | [1],[3] | 3 years 10 months | 3 years 11 months
Single Name Credit Default Swaps [Member] | Standard & Poor's, BBB Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 1,426 | $ (5,066)
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 347,200 | $ 315,200
Derivative Average Remaining Maturity | [1],[3] | 3 years 8 months | 4 years 2 months
Single Name Credit Default Swaps [Member] | Standard & Poor's, BB+ Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ (477) | $ (2,900)
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 9,000 | $ 10,000
Derivative Average Remaining Maturity | [1],[3] | 3 years 6 months | 4 years 1 month
Credit Default Swaps Referencing Indices [Member] | Standard Poors AAA To A Ratings [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative Average Remaining Maturity | [1],[3] | 0 years | 0 years
Credit Default Swaps Referencing Indices [Member] | Standard & Poor's, BBB Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Credit Derivative Current Fair Value | [1] | $ 6,295 | $ 2,274
Maximum Potential Future Exposure on Credit Risk Derivatives | [1],[2] | $ 416,000 | $ 416,000
Derivative Average Remaining Maturity | [1],[3] | 5 years | 5 years
Credit Default Swaps Referencing Indices [Member] | Standard & Poor's, BB+ Rating [Member] |  |  |
Credit Derivatives [Line Items] |  |  |
Derivative Average Remaining Maturity | [1],[3] | 0 years | 0 years
[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=64837297&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 liability. + References Reference 1: 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=73719730&loc=d3e13433-108611 Reference 2: 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=64837297&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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