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Inventories, net - Schedule of Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Pipe and connectors, net of allowance of $21,270 and $20,064, respectively	$ 18,026		$ 33,620
Finished goods, net of allowance of $1,354 and $1,520, respectively	22,608		14,541
Work in progress	8,285		9,206
Raw materials, components and supplies	20,463		19,053
Total inventories, net	69,382	$ 72,860	76,420
Pipe and connectors
Inventory [Line Items]
Allowance	21,270		20,064
Finished Goods
Inventory [Line Items]
Allowance	$ 1,354		$ 1,520

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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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