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Benefit Plans - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Requisite service period | 30 days |  |
Minimum participant age | 21 years |  |
Employer matching contribution, percent of match | 6.00% |  |
Employers matching contribution, vesting percentage | 100.00% |  |
Total plan contributions | $ 5,600,000 | $ 4,000,000.0 | $ 3,600,000
Period with five consecutive years of highest average compensation | 10 years |  |
U.S. Oil plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected future employer contributions, next fiscal year | $ 500,000 |  |
Wyoming Refining plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected future employer contributions, next fiscal year | $ 0 |  |

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- Definition Defined Benefit Plan, Five Consecutive Years Of Highest Compensation Requisite Service Period + References No definition available. + Details
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- Definition Defined Contribution Plan, Minimum Participant Age + References No definition available. + Details
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- Definition Defined Contribution Plan, Plan Participation, Minimum Requisite Period + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + Details
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- Details
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- Details
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