Inventory Inventory (Policies)	3 Months Ended
	Mar. 31, 2022
Inventory Disclosure [Abstract]
Inventory, Policy [Policy Text Block]	Crude oil, work in process, refined products, blendstocks and asphalt inventory for all of our operations, excluding merchandise inventory in our retail segment, are stated at the lower of cost determined using FIFO basis or net realizable value. Retail merchandise inventory consists of cigarettes, beer, convenience merchandise and food service merchandise and is stated at estimated cost as determined by the retail inventory method.Effective January 1, 2022, we changed our method for valuing the inventory held at the Tyler Refinery to the FIFO inventory valuation method from the LIFO inventory valuation method. Total inventories accounted for using LIFO, prior to the accounting method change, comprised 28.0% of the Company’s total inventories as of December 31, 2021. This change in accounting method is preferable because it provides better consistency across our refineries and improved transparency, and results in recognition that better reflects the physical flow of inventory and more accurately reflects the current value of inventory. After this change, we no longer utilize the LIFO valuation method and the majority of our inventories are now valued using the FIFO cost method, with the remainder valued using the Retail method for the retail segment inventory. The effects of this change have been retrospectively applied to all periods presented. This change resulted in a decrease to retained earnings of $8.7 million as of January 1, 2021 in accordance with ASC 250, Accounting Changes and Error Corrections.