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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, 2020 | Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | $ 50,095 | $ 19,383
Not Designated as Hedging Instrument |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | 39,251 | 19,383
Not Designated as Hedging Instrument | Net realized and unrealized (losses) gains on investments | Interest rate futures |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | 88,006 | 6,056
Not Designated as Hedging Instrument | Net realized and unrealized (losses) gains on investments | Interest rate swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | 2,107 | 349
Not Designated as Hedging Instrument | Net realized and unrealized (losses) gains on investments | Credit default swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | (4,897) | 4,410
Not Designated as Hedging Instrument | Net realized and unrealized (losses) gains on investments | Total return swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | (21,137) | 534
Not Designated as Hedging Instrument | Net realized and unrealized (losses) gains on investments | Equity futures |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of gain (loss) recognized on derivatives | (30,898) | 2,447
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 | (330) | 4,442
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 | 6,400 | 1,145
Designated as Hedging Instrument | Foreign currency forward contracts, investment operations |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Accumulated other comprehensive loss | $ 10,844 | $ 0

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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=109980867&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=118930883&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,c) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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