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

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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