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Inventory - Schedule of Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Inventory
Equipment and materials	$ 21,827	$ 25,103
Crude oil inventory	11,006	8,826
Total inventory	32,833	33,929
Long-term inventory
Linefill in third party pipelines	8,683	14,522
Total long-term inventory	8,683	14,522
Total	$ 41,516	$ 48,451

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

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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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