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Inventory- Schedule of Inventory (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Inventory |  |
Crude oil inventory | $ 7,000 | $ 10,427
Equipment and materials | 16,222 | 8,940
Total inventory | 23,222 | 19,367
Long-term inventory |  |
Linefill in third-party pipelines | 12,505 | 12,200
Long-term inventory | 12,505 | 12,200
Total | $ 35,727 | $ 31,567

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