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Inventory- Schedule of Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Inventory
Crude oil inventory	$ 17,542	$ 14,933
Equipment and materials	18,727	18,195
Total inventory	36,269	33,128
Long-term inventory
Linefill in third party pipelines	13,767	12,260
Total long-term inventory	13,767	12,260
Total	$ 50,036	$ 45,388

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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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- Definition

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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