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Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory
Crude oil inventory	$ 10,427	$ 7,086
Equipment and materials	8,940	3,562
Total inventory	19,367	10,648
Long-term inventory
Linefill in third-party pipelines	12,200	0
Long-term inventory	12,200	0
Total	$ 31,567	$ 10,648

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Inventory, Noncurrent, Linefill

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No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-Section 35
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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- Definition

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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