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Derivatives and Fair Value (Effect of Derivative Instruments on the Condensed Consolidated Statements of Operations) (Details) - Crude Oil Swaps [Member] - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative instruments gain (loss), net | $ (5,954) | $ 7,339
Realized Gain (Loss) - Contract Settlements [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative instruments gain (loss), net | (1,710) | 718
Unrealized Gain (Loss) [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative instruments gain (loss), net | $ (4,244) | $ 6,621

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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=109980867&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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