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Inventories (Details) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Inventories [Abstract]    
Raw materials $ 19,249,000 $ 21,063,000
Work in process 14,372,000 14,027,000
Finished goods 3,027,000 4,037,000
Inventories, total 36,648,000 39,127,000 [1]
Inventory reserve $ 11,900,000 $ 11,000,000
[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 31, 2013.