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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Pipe and connectors $ 96,821 $ 102,360
Finished goods 14,770 14,257
Work in progress 7,122 7,099
Raw materials, components and supplies 17,723 15,363
Total inventories $ 136,436 $ 139,079