Amortization Period of Planned Major Maintenance Activities, Maximum

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Amortization Period of Planned Major Maintenance Activities, Minimum

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Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]

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Payments for Deferred Turnaround Expenditures

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Contractual interest rate for funds borrowed, under the debt agreement.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Discount rate from fair value on offering date that participants pay for shares.

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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2016
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Amortization period of planned major maintenance activities, minimum	3 years
Amortization period of planned major maintenance activities, maximum	5 years
Deferred turnaround expenditures	$ 49,770,000	$ 9,800,000	$ 0
Refining And Retail Segment
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Impairment expense	$ 67,922,000
ESPP \| Common Stock
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Discount from market price, offering date	15.00%
5.00% Convertible Senior Notes due 2021
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Debt instrument, interest rate	5.00%			5.00%
Convertible Debt \| 5.00% Convertible Senior Notes due 2021
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Debt instrument, interest rate	5.00%			5.00%
Laramie Energy Company
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Impairment charge	$ 45,294,000	$ 81,515,000	$ 0