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Net investment income (loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net Investment Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on investments and investment derivatives |  |  |  |  |  |  |  |  | $ 46,369 | $ (5,850) | $ 446,646
Net change in unrealized gains (losses) on investments and investment derivatives |  |  |  |  |  |  |  |  | 14,881 | 8,381 | (412,650)
Net gains (losses) on currencies |  |  |  |  |  |  |  |  | 7,998 | 12,806 | (7,305)
Dividend and interest income |  |  |  |  |  |  |  |  | 16,035 | 18,551 | 53,523
Dividends paid on securities sold, not yet purchased |  |  |  |  |  |  |  |  | 0 | 0 | (5,259)
Other expenses |  |  |  |  |  |  |  |  | (1,333) | (954) | (15,696)
Management and performance fees to related parties (1) |  |  |  |  |  |  |  |  | 0 | 0 | (29,845)
Investment income, net, related party investment fund |  |  |  |  |  |  |  |  | 194,988 | 249,626 | (280,847)
Net investment income (loss) | $ 204,798 | $ 121,956 | $ 137,211 | $ (185,027) | $ 61,614 | $ (3,138) | $ 69,131 | $ 154,953 | $ 278,938 | $ 282,560 | $ (251,433)

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- Definition The net income earned from investments in securities and other investments including derivatives. It includes dividends from shares in corporations, and interest from bonds, loans, mortgages, derivatives, commercial paper, bank accounts, certificates of deposits, treasuries, and other financial securities. It also includes realized and unrealized gains and losses on all investments. + References No definition available. + Details
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- Definition Costs associated with revenues arising from an entity that is an affiliate of the reporting entity by means of direct or indirect ownership. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 + Details
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