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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Pipe and connectors $ 88,982 $ 102,360
Finished goods 16,063 14,257
Work in progress 8,644 7,099
Raw materials, components and supplies 19,272 15,363
Total inventories $ 132,961 $ 139,079