Organization and Basis of Presentation - Risk, Impairment, etc. (Details) - customer	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Sales Revenue | Product
Concentration of Risk
Percentage of consolidated total	100.00%	100.00%	100.00%	100.00%
Sales Revenue | Product | Gasoline and gasoline blendstocks
Concentration of Risk
Percentage of consolidated total	69.00%	81.00%	67.00%	74.00%
Sales Revenue | Product | Distillates, home heating oil, diesel and kerosene
Concentration of Risk
Percentage of consolidated total	23.00%	15.00%	27.00%	22.00%
Sales Revenue | Product | Crude Oil And Crude Oil Logistics [Member]
Concentration of Risk
Percentage of consolidated total	1.00%	1.00%	1.00%	1.00%
Sales Revenue | Product | Station operations (convenience stores, rental and sundries)
Concentration of Risk
Percentage of consolidated total	7.00%	3.00%	5.00%	3.00%
Sales Revenue | Customer
Concentration of Risk
Number of significant customers	0	0	0	0
Product Margin [Member]
Concentration of Risk
Percentage of consolidated total	100.00%	100.00%	100.00%	100.00%
Product Margin [Member] | Wholesale Segment
Concentration of Risk
Percentage of consolidated total	43.00%	20.00%	27.00%	20.00%
Product Margin [Member] | Gasoline Distribution and Station Operations Segment
Concentration of Risk
Percentage of consolidated total	56.00%	77.00%	71.00%	77.00%
Product Margin [Member] | Commercial Segment
Concentration of Risk
Percentage of consolidated total	1.00%	3.00%	2.00%	3.00%