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Derivatives and Fair Value (Narrative) (Details) | Jan. 22, 2021 $ / bbl bbl | May 06, 2019 $ / bbl bbl | Jun. 30, 2018 bbl $ / bbl
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Commodity Contract, June 2018 Through June 2019 [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, average price per barrel | $ / bbl |  |  | 74.00
Derivative, nonmonetary notional amount | bbl |  |  | 400,000
Commodity Contract, July 19 Through June 2020 [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, average price per barrel | $ / bbl |  | 66.70 |
Barrels | bbl |  | 500,000 |
Subsequent Event [Member] | Commodity Contract, February 2021 Through January 2022 [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, average price per barrel | $ / bbl | 53.10 |  |
Barrels | bbl | 709,262 |  |

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- Definition Nominal number of units used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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