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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 | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | $ 792 | $ 6,222 | $ (23,942)
Net realized and unrealized (losses) gains on investments | Interest rate futures |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | (5,594) | (3,252) | (17,379)
Net realized and unrealized (losses) gains on investments | Interest rate swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | (84) | 436 | 0
Net realized and unrealized (losses) gains on investments | Credit default swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | (3,106) | 326 | 1,965
Net foreign exchange (losses) gains | Foreign currency forward contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 3,840 | 9,628 | (6,937)
Net foreign exchange (losses) gains | Foreign currency forward contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | $ 5,736 | $ (916) | $ (1,591)

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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