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Derivative Instruments (Schedule of Gain (Loss) Recognized in Consolidated Statements of Operations Related to Principal Derivative Instruments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | $ 70,862 | $ 11,980 | $ 6,222
Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 69,903 | 11,980 | 6,222
Foreign currency forward contracts | Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Accumulated other comprehensive income (loss) | 959 | 0 | 0
Net realized and unrealized (losses) gains on investments | Interest rate futures | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 16,848 | 6,109 | (3,252)
Net realized and unrealized (losses) gains on investments | Interest rate swaps | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 1,488 | (84) | 436
Net realized and unrealized (losses) gains on investments | Credit default swaps | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 7,043 | (3,106) | 326
Net realized and unrealized (losses) gains on investments | Total return swaps | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 12,155 | 0 | 0
Net realized and unrealized (losses) gains on investments | Equity futures | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 21,357 | (515) | 0
Net foreign exchange (losses) gains | Foreign currency forward contracts | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | 12,617 | 3,840 | 9,628
Net foreign exchange (losses) gains | Foreign currency forward contracts | Not Designated as Hedging Instrument |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized on derivatives | $ (1,605) | $ 5,736 | $ (916)

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