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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Pipe and connectors	$ 184,967fi_InventoryPipeandConnectors	$ 185,076fi_InventoryPipeandConnectors
Finished goods	4,260	4,291
Work in progress	6,381	3,363
Raw materials, components and supplies	12,400	11,278
Total inventories	$ 208,008us-gaap_InventoryNet	$ 204,008us-gaap_InventoryNet

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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