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Derivative Instruments (Gain (Loss) Recognized in the Consolidated Statements of Operations Related to its Derivative Instruments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ (3,708) |  | $ (3,708) |
Amount of gain (loss) recognized on derivatives | 26,991 | $ (3,993) | 42,358 | $ (2,305)
Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 26,147 | (3,993) | 41,514 | (2,305)
Not Designated as Hedging Instrument | Net realized and unrealized gains (losses) on investments | Interest rate futures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 23,077 | (115) | 29,307 | (2,439)
Not Designated as Hedging Instrument | Net realized and unrealized gains (losses) on investments | Interest rate swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 835 | 241 | 1,184 | 135
Not Designated as Hedging Instrument | Net realized and unrealized gains (losses) on investments | Total return swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 4,501 | 0 | 5,035 | 0
Not Designated as Hedging Instrument | Net realized and unrealized gains (losses) on investments | Credit default swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 1,046 | 884 | 5,456 | (1,037)
Not Designated as Hedging Instrument | Net realized and unrealized gains (losses) on investments | Equity futures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 7,714 | 28 | 9,987 | 15
Not Designated as Hedging Instrument | Net foreign exchange gains (losses) | Foreign currency forward contracts, underwriting and non-investment operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | (11,616) | (6,374) | (7,174) | 369
Not Designated as Hedging Instrument | Net foreign exchange gains (losses) | Foreign currency forward contracts, investment operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 590 | 1,343 | (2,281) | 652
Designated as Hedging Instrument | Foreign currency forward contracts, investment operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ 844 | $ 0 | $ 844 | $ 0

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