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Derivative Activities - Effects of Derivatives on Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Derivative [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | $ 111,195 | $ (162,798) | $ 276,752 | $ (75,890)
Collars |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | 4,790 |  | 14,265 |
Puts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | 3,012 |  | 9,719 |
Calls |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | 529 |  | 1,040 |
Basis Swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | 9,304 | (4,199) | (8,668) | 3,075
Commodity | Swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | 93,567 | (158,576) | 260,319 | (78,931)
Freight | Commodity | Swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | $ (7) | $ (23) | $ 77 | $ (34)

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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