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Benefit Plans - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Requisite service period |  | 30 days |  |
Employer matching contribution, percent of match |  | 6.00% |  |
Employers matching contribution, vesting percentage |  | 100.00% |  |
Defined contribution plan, maximum annual contributions per employee, amount |  | $ 130,000 |  |
Total plan contributions |  | $ 3,100,000 | $ 5,600,000 | $ 5,600,000
Period with five consecutive years of highest average compensation |  | 10 years |  |
Defined benefit plan, benefit Obligation, period increase (decrease) |  | $ (6,000,000) |  |
Gain on curtailment of pension obligation |  | 2,032,000 | $ 0 | $ 0
Defined benefit plan, actuarial gain |  | $ (4,000,000) |  |
Defined benefit plan assumptions used calculating benefit obligation change in discount rate | 23.00% |  |  |
Rate of compensation increase | 3.00% |  |  |
Wyoming Refining plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discount rate | 3.25% | 2.85% | 2.65% | 3.30%
Rate of compensation increase |  | 0.00% | 3.00% | 3.00%
U.S. Oil plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discount rate |  | 2.70% | 2.35% | 3.10%
Rate of compensation increase |  | 3.00% | 3.00% | 3.00%
Expected future employer contributions, next fiscal year |  | $ 0 |  |

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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