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Financial Instruments and Risk Management (Recognized Gains and Losses for Derivative Instruments Not Designated as Hedging Instruments) (Details) - Not Designated as Hedging Instrument - (Loss) gain on derivative instruments - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Commodity derivative contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
(Loss) gain on derivative instruments | $ (43,235) | $ (5,290) | $ (483,865) | $ 319,502
Commodity collars |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
(Loss) gain on derivative instruments | $ (15,929) | $ 0 | $ (15,929) | $ 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/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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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