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Inventories, net (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Inventories, net
Raw materials	$ 70,975,000	$ 65,723,000
Work in process	24,655,000	22,358,000
Finished goods (completed systems)	13,895,000	15,982,000
Inventories, net	109,525,000us-gaap_InventoryNet	104,063,000us-gaap_InventoryNet
Inventory reserves	$ 22,500,000us-gaap_InventoryValuationReserves	$ 23,600,000us-gaap_InventoryValuationReserves

Amount of valuation reserve for inventory.

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- Definition

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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