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Inventories Components of inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Parts and raw materials	$ 61,577	$ 57,962
Work in process	6,519	3,708
Finished goods	19,515	18,613
Inventory, Net	$ 87,611	$ 80,283

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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