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Derivative Instruments - Summary of net realized gains (losses) recorded in the consolidated statements of income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Net realized gains (losses) on derivative instruments |  |  |  |  |  |  |
Net realized gains (losses) on derivative instruments | [1] | $ (51,109) |  | $ (836) |  | $ (14,993) | $ 126,353
Not designated as hedging instrument |  |  |  |  |  |  |
Net realized gains (losses) on derivative instruments |  |  |  |  |  |  |
Net realized gains (losses) on derivative instruments |  | (51,109) |  | (836) |  | (14,993) | 126,353
Futures contracts | Not designated as hedging instrument |  |  |  |  |  |  |
Net realized gains (losses) on derivative instruments |  |  |  |  |  |  |
Net realized gains (losses) on derivative instruments |  | (54,759) |  | (1,607) |  | (7,321) | 94,337
Foreign currency forward contracts | Not designated as hedging instrument |  |  |  |  |  |  |
Net realized gains (losses) on derivative instruments |  |  |  |  |  |  |
Net realized gains (losses) on derivative instruments |  | 1,295 |  | 3,523 |  | (20,776) | (7,347)
TBAs | Not designated as hedging instrument |  |  |  |  |  |  |
Net realized gains (losses) on derivative instruments |  |  |  |  |  |  |
Net realized gains (losses) on derivative instruments |  | 0 |  | 264 |  | 0 | 1,009
Other | Not designated as hedging instrument |  |  |  |  |  |  |
Net realized gains (losses) on derivative instruments |  |  |  |  |  |  |
Net realized gains (losses) on derivative instruments |  | $ 2,355 | [2] | $ (3,016) | [2] | $ 13,104 | $ 38,354
[1] | See note 9 for information on the Company’s derivative instruments.
[2] | Includes realized gains and losses on swaps, options and other derivatives contracts

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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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