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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | $ 14,973 | $ 26,991 | $ 65,068 | $ 42,358
Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 23,667 | 26,147 | 62,918 | 41,514
Not Designated as Hedging Instrument | Net realized and unrealized gains on investments | Interest rate futures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 2,557 | 22,253 | 90,563 | 28,307
Not Designated as Hedging Instrument | Net realized and unrealized gains on investments | Interest rate swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 502 | 835 | 2,609 | 1,184
Not Designated as Hedging Instrument | Net realized and unrealized gains on investments | Credit default swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 1,974 | 1,046 | (2,923) | 5,456
Not Designated as Hedging Instrument | Net realized and unrealized gains on investments | Total return swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 14,151 | 4,501 | (6,986) | 5,035
Not Designated as Hedging Instrument | Net realized and unrealized gains on investments | Equity futures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 5,188 | 8,538 | (25,710) | 10,987
Not Designated as Hedging Instrument | 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 | 6,908 | (11,616) | 6,578 | (7,174)
Not Designated as Hedging Instrument | Net foreign exchange (losses) gains | Foreign currency forward contracts, investment operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | (7,613) | 590 | (1,213) | (2,281)
Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | (8,694) | 844 | 2,150 | 844
Designated as Hedging Instrument | Foreign currency forward contracts, investment operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ (8,694) | $ 844 | $ 2,150 | $ 844

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