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Inventory
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventory
Inventory

Inventories consisted of $13.1 million and $20.9 million of refined petroleum products as of March 31, 2018 and December 31, 2017, respectively. 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 goods sold in the consolidated statements of income and comprehensive income, which amounted to a nominal amount during both three month periods ended March 31, 2018 and 2017.