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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | $ 8,249 |  | $ 4,541 |
Amount of gain (loss) recognized on derivatives | 9,397 | $ 617 | 51,755 | $ (1,688)
Not Designated as Hedging Instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 6,133 | 617 | 47,647 | (1,688)
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 | 7,199 | 2,731 | 35,136 | 292
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 | 887 | (6) | 2,071 | 129
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 | 65 | (191) | 5,521 | (1,228)
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 | 1,960 | 0 | 6,995 | 0
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 | 1,023 | 29 | 12,380 | 44
Not Designated as Hedging Instrument | Net foreign exchange losses | Foreign currency forward contracts, underwriting and non-investment operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | (5,912) | (2,596) | (13,086) | (2,227)
Not Designated as Hedging Instrument | Net foreign exchange losses | Foreign currency forward contracts, investment operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized on derivatives | 911 | 650 | (1,370) | 1,302
Designated as Hedging Instrument | Foreign currency forward contracts, investment operations |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Accumulated other comprehensive income (loss) | $ 3,264 | $ 0 | $ 4,108 | $ 0

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