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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
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Mar. 31, 2022 | Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | $ (66,348) | $ 4,070
Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | (63,321) | 6,159
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 | (28,787) | 15,507
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 | 0 | (901)
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 | (4,137) | 255
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 | (7,364) | 0
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 | (21,142) | (3,641)
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 | (1,891) | (5,061)
Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | (3,027) | (2,089)
Designated as Hedging Instrument | Foreign currency forward contracts, investment operations |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Accumulated other comprehensive income (loss) | $ (3,027) | $ (2,089)

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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=125515794&loc=SL5618551-113959 + Details
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- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 + Details
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