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Inventories (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Summary of inventories
Finished goods	$ 40,898	$ 37,415
Work in process	35,638	32,383
Raw materials and supplies	86,384	73,455
Inventories	$ 162,920	$ 143,253

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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