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Commitments and Contingencies - Crude Oil Releases (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($) crudeOilRelease	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Number Of Crude Oil Releases | crudeOilRelease	0
Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses		$ 500	$ 7,100
Accrual for environmental loss contingencies, period increase (decrease)	$ 100
Operating Expense [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 300

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- Definition

Number Of Crude Oil Releases

+ References

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- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

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Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion.

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Increase (decrease) in the accrual for environmental loss contingencies during the reporting period.

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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.

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