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Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of inventories
Finished goods	$ 37,415	$ 34,446
Work in process	32,383	34,466
Raw materials and supplies	73,455	70,814
Total Inventory	$ 143,253	$ 139,726

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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