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Inventories, net - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Pipe and connectors, net of allowance of $20,064 and $2,108, respectively $ 33,620 $ 102,360
Finished goods, net of allowance of $1,520 and $2,518, respectively 14,541 14,257
Work in progress 9,206 7,099
Raw materials, components and supplies 19,053 15,363
Total inventories, net 76,420 139,079
Pipe and connectors    
Inventory [Line Items]    
Allowance 20,064 2,108
Finished Goods    
Inventory [Line Items]    
Allowance $ 1,520 $ 2,518