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Inventories, net (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Pipe and connectors, net of allowance of $19,255 and $21,270, respectively	$ 12,896	$ 18,026
Finished goods, net of allowance of $905 and $1,354, respectively	27,071	22,608
Work in progress	8,964	8,285
Raw materials, components and supplies	26,220	20,463
Total inventories, net	75,151	69,382
Pipe and Connectors
Inventory [Line Items]
Allowance	19,255	21,270
Finished Goods
Inventory [Line Items]
Allowance	$ 905	$ 1,354

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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