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Significant Accounting Policies - Additional Information (Details) - Segment	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Significant Accounting Policies [Line Items]
Number of segments	2
Motor Fuel Gallons [Member]
Significant Accounting Policies [Line Items]
Percentage of product sold, delivered by one carrier	16.00%
Motiva [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage		12.00%
Circle K [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage		15.00%	10.00%
Wholesale Distribution Volumes [Member] | DMS [Member] | Sales Revenue, Net [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage		8.00%	11.00%
Wholesale Distribution Volumes [Member] | Circle K Stores Inc. [Member] | Sales Revenue, Net [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage		6.00%	7.00%
Rental Income [Member] | DMS [Member] | Sales Revenue, Net [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage		7.00%	15.00%
Rental Income [Member] | Circle K Stores Inc. [Member] | Sales Revenue, Net [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage		14.00%	20.00%
Supplier Concentration Risk [Member] | Purchases Net [Member] | ExxonMobil, Corp [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	29.00%	26.00%	26.00%
Supplier Concentration Risk [Member] | Purchases Net [Member] | BP P.L.C [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	22.00%	22.00%	26.00%
Supplier Concentration Risk [Member] | Purchases Net [Member] | Motiva [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	13.00%		13.00%
Supplier Concentration Risk [Member] | Purchases Net [Member] | Marathon Petroleum Company LP [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	10.00%
Supplier Concentration Risk [Member] | Purchases Net [Member] | Other suppliers [Member]
Significant Accounting Policies [Line Items]
Concentration Risk, Percentage	10.00%	10.00%	10.00%
Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Percentage effect on revenue	90.00%
Distribution Rights [Member]
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Minimum [Member]
Significant Accounting Policies [Line Items]
Likelihood percentage that fair value of reporting unit is less than it's carrying amount, including goodwill	50.00%
Minimum [Member] | Covenant Not to Compete [Member]
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Maximum [Member] | Covenant Not to Compete [Member]
Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Building and Building Improvements [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Building and Building Improvements [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Equipment [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Equipment [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	30 years
Leasehold Improvements [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Leasehold Improvements [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	10 years

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The percentage of the effect of a change in accounting principle on revenue.

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Line items that represent financial concepts included in significant accounting policies table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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