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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Pipe and connectors $ 119,818 $ 137,245
Finished goods 4,245 4,020
Work in progress 5,955 5,230
Raw materials, components and supplies 15,168 14,768
Total inventories $ 145,186 $ 161,263