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Inventory
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Inventory InventoryInventories consisted of $1.8 million and $2.4 million of refined petroleum products as of March 31, 2022 and December 31, 2021, respectively, each of which are net of lower of cost or net realizable value reserve of a nominal amount. Inventory is stated at the lower of cost or net realizable value, with cost determined on a first-in, first-out basis. We recognize lower of cost or net realizable value charges as a component of cost of materials and other in the consolidated statements of income and comprehensive income.