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Inventory
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventory InventoryInventories consisted of $1.7 million and $12.6 million of refined petroleum products as of September 30, 2020 and December 31, 2019, 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.