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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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