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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Derivative [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | $ (162,798) | $ (34,791) | $ (75,890) | $ 88,048
Collars |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | 0 | (1,650) | 0 | 6,765
Basis Swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | (4,199) | 8,959 | 3,075 | (2,393)
Commodity | Swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | (158,576) | (42,100) | (78,931) | 83,676
Freight | Swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Fair Value Income (Loss) | $ (23) | $ 0 | $ (34) | $ 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/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=64837297&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=64837297&loc=SL5624171-113959 + Details
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