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Derivative Activities - Effects of Derivatives on Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |
Derivative Fair Value Income (Loss) | $ 187,711 | $ 226,681 | $ (51,192)
Contingent Consideration |  |  |
Derivative [Line Items] |  |  |
Derivative Fair Value Income (Loss) | 970 | 0 | 0
Swaption |  |  |
Derivative [Line Items] |  |  |
Derivative Fair Value Income (Loss) | (4,955) | 333 | (6,556)
Collars |  |  |
Derivative [Line Items] |  |  |
Derivative Fair Value Income (Loss) | 3,304 | (3,903) | 17,583
Three Way Collars |  |  |
Derivative [Line Items] |  |  |
Derivative Fair Value Income (Loss) | (16,346) | 0 | 0
Basis Swaps |  |  |
Derivative [Line Items] |  |  |
Derivative Fair Value Income (Loss) | 48,278 | 6,661 | (1,104)
Calls |  |  |
Derivative [Line Items] |  |  |
Derivative Fair Value Income (Loss) | (558) | (349) | (2,653)
Commodity | Swap |  |  |
Derivative [Line Items] |  |  |
Derivative Fair Value Income (Loss) | 158,248 | 219,968 | (57,950)
Freight | Swap |  |  |
Derivative [Line Items] |  |  |
Derivative Fair Value Income (Loss) | $ (1,230) | $ 3,971 | $ (512)

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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=121590274&loc=SL5618551-113959 + Details
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