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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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	$ (100,754)	$ (8,492)	$ (167,102)	$ (4,422)
Derivative instruments not designated as hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	(108,075)	(10,929)	(171,396)	(4,770)
Derivative instruments not designated as hedges | Net realized and unrealized gains (losses) on investments | Interest rate futures
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	(14,699)	(11,295)	(43,486)	4,212
Derivative instruments not designated as hedges | 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	(78)	0	(979)
Derivative instruments not designated as hedges | Net realized and unrealized gains (losses) on investments | Credit default swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	(2,337)	1,169	(6,474)	1,424
Derivative instruments not designated as hedges | Net realized and unrealized gains (losses) on investments | Total return swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	0	875	0	875
Derivative instruments not designated as hedges | Net realized and unrealized gains (losses) on investments | Equity futures
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	(49,042)	0	(56,406)	0
Derivative instruments not designated as hedges | 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	(51,834)	240	(72,757)	(3,401)
Derivative instruments not designated as hedges | Net foreign exchange gains (losses) | Foreign currency forward contracts, investment operations
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	10,062	(1,840)	8,171	(6,901)
Derivative instruments not designated as hedges | Net foreign exchange gains (losses) | Foreign currency option contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized on derivatives	(225)	0	(444)	0
Derivative instruments designated as hedges | Foreign currency forward contracts, investment operations
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated other comprehensive income (loss)	$ 7,321	$ 2,437	$ 4,294	$ 348

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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 https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959

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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 https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580

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