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Inventory - Schedule of Inventory (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Inventory Disclosure [Abstract] |  |
Crude oil inventory | $ 5,430 | $ 6,152
Equipment and materials | 3,588 | 4,920
Total inventory | $ 9,018 | $ 11,072

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