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Benefit Plans - Unfunded Status (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | $ 43,287 | $ 41,367 | $ 56,411
Fair value of plan assets | 42,459 | 40,639 | $ 49,821
WY Refining |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | 25,582 | 24,730 |
Fair value of plan assets | 22,219 | 21,940 |
Underfunded/(overfunded) status | 3,363 | 2,790 |
Non-current assets | 0 | 0 |
Non-current liabilities | (3,363) | (2,790) |
Net amount recorded | (3,363) | (2,790) |
Net actuarial gain (loss) | 4,546 | 5,243 |
Total accumulated other comprehensive income (loss) | 4,546 | 5,243 |
U.S. Oil |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | 17,705 | 16,637 |
Fair value of plan assets | 20,240 | 18,699 |
Underfunded/(overfunded) status | (2,535) | (2,062) |
Non-current assets | 2,535 | 2,062 |
Non-current liabilities | 0 | 0 |
Net amount recorded | 2,535 | 2,062 |
Net actuarial gain (loss) | 376 | (318) |
Total accumulated other comprehensive income (loss) | $ 376 | $ (318) |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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