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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Inventories
Raw material	$ 9,665	$ 9,194	$ 9,593
Work-in-process	11,351	15,470	11,731
Finished goods	45,071	47,007	52,681
Inventory, net	$ 66,087	$ 71,671	$ 74,005

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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