Supplemental Disclosures to the Financial Statements - Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid expenses	$ 4,526	$ 4,577
Materials and supplies	11,731	10,544
Oil inventories	3,409	3,432
Other	652	846
Total other current assets	$ 20,318	$ 19,399

Energy Related Inventory, Materials And Supplies

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The aggregate carrying amount as of the balance sheet date of unrefined petroleum and the liquid hydrocarbon components recovered from natural gas.

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Amount of current assets classified as other.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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