Summary of Significant Accounting Policies (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Components of inventory
Raw materials and parts	$ 111,143	$ 101,660
Work-in-progress	50,596	36,615
Finished goods	103,612	78,829
Total Inventory, Net	$ 265,351	$ 217,104

Carrying amount as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).

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- Definition

Aggregated amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

+ References

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Carrying amount as of the balance sheet date of merchandise or goods which are partially completed, are generally comprised of raw materials, labor and factory overhead costs, and 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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