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Inventory - Schedule of Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Inventory
Equipment and materials	$ 23,713	$ 25,103
Crude oil inventory	5,710	8,826
Total inventory	29,423	33,929
Long-term inventory
Linefill in third party pipelines	15,805	14,522
Total long-term inventory	15,805	14,522
Total	$ 45,228	$ 48,451

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- Definition

This element represents the aggregate of current and non-current inventory, including linefill.

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- Definition

Inventory, Noncurrent, Linefill

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- Definition

Carrying amount as of the balance sheet date of petroleum or crude oil.

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- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle.

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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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