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Derivative Instruments (Gain (Loss) Recognized In The Consolidated Statements Of Operations Related To Its Derivative Instruments) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | $ (2,004) | $ 6,335 | $ 3,055 | $ (30,671)
Net realized and unrealized gains on investments | Interest rate futures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | (3,016) | 1,040 | (4,064) | (27,775)
Net realized and unrealized gains on investments | Interest rate swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 271 | 0 | 271 | 0
Net realized and unrealized gains on investments | Credit default swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | (1,275) | 687 | (551) | 902
Net foreign exchange (losses) gains | Foreign Currency Forward Contracts, Underwriting and Non-investment Operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 2,056 | 5,097 | 8,339 | (92)
Net foreign exchange (losses) gains | Foreign Currency Forward Contracts, Investment Operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | $ (40) | $ (489) | $ (940) | $ (3,706)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + 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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