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Financial Instruments and Risk Management (Tables) | 12 Months Ended
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Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Fair Value of Derivative Instruments Not Designated as Hedging Instruments | At December 31, 2020 and 2019, the fair value of derivative instruments not designated as hedging instruments are presented in the following table.
|  | December 31, 2020 |  | December 31, 2019
(Thousands of dollars) |  | Asset (Liability) Derivatives |  | Asset (Liability) Derivatives
Type of Derivative Contract |  | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value
Commodity |  | Accounts receivable |  | $ | 13,050 |  |  | Accounts payable |  | $ | (33,364) |
|  | Accounts payable |  | (89,842) |  |  |  |  |
|  | Deferred credits and other liabilities |  | (12,833) |  |  |  |  |
Recognized Gains and Losses for Derivative Instruments Not Designated as Hedging Instruments | For the years ended December 31, 2020, 2019, and 2018, the gains and losses recognized in the Consolidated Statements of Operations for derivative instruments not designated as hedging instruments are presented in the following table.
|  |  |  | Gain (Loss)
(Thousands of dollars) |  |  |  | Year Ended December 31,
Type of Derivative Contract |  | Statement of Operations Locations |  | 2020 |  | 2019 |  | 2018
Commodity |  | (Loss) gain on crude contracts |  | $ | 202,661 |  |  | (856) |  |  | (41,975) |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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