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Inventory- Schedule of Inventory (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Inventory |  |
Crude oil inventory | $ 10,302 | $ 7,086
Equipment and materials | 4,025 | 3,562
Total inventory | $ 14,327 | $ 10,648

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