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Inventories, net (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]      
Pipe and connectors, net of allowance of $19,868 and $20,064, respectively $ 27,930   $ 33,620
Finished goods, net of allowance of $1,517 and $1,520, respectively 15,016   14,541
Work in progress 9,179   9,206
Raw materials, components and supplies 20,382   19,053
Total inventories, net 72,507 $ 72,860 76,420
Pipe and Connectors      
Inventory [Line Items]      
Allowance 19,868   20,064
Finished Goods      
Inventory [Line Items]      
Allowance $ 1,517   $ 1,520