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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Pipe and connectors $ 131,542 $ 137,245
Finished goods 3,959 4,020
Work in progress 5,492 5,230
Raw materials, components and supplies 15,234 14,768
Total inventories $ 156,227 $ 161,263