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Inventories - Schedule of Wellsite Storage Solutions inventory (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Inventory [Line Items] |  |
Total inventory | $ 12,381 | $ 18,575
Wellsite storage solutions |  |
Inventory [Line Items] |  |
Work in progress | 0 | 1,300
Total inventory | $ 0 | $ 1,300

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