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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 | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, gain (loss) | $ (446) | $ 4,264 | $ (1,032)
Realized Gain - Contract Settlements [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, gain (loss) | 2,439 | 744 | 195
Unrealized (Gain) Loss [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative, gain (loss) | $ (2,885) | $ 3,520 | $ (1,227)

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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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