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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Pipe and connectors $ 102,360 $ 137,245
Finished goods 14,257 4,020
Work in progress 7,099 5,230
Raw materials, components and supplies 15,363 14,768
Total inventories $ 139,079 $ 161,263