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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | $ 617 | $ (2,004) | $ (1,688) | $ 3,055
Net realized and unrealized gains (losses) on investments | Interest rate futures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 2,760 | (3,016) | 336 | (4,064)
Net realized and unrealized gains (losses) on investments | Interest rate swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | (6) | 271 | 129 | 271
Net realized and unrealized gains (losses) on investments | Credit default swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | (191) | (1,275) | (1,228) | (551)
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 | (2,596) | 2,056 | (2,227) | 8,339
Net foreign exchange (losses) gains | Foreign currency forward contracts, investment operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | $ 650 | $ (40) | $ 1,302 | $ (940)

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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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