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Inventories (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Inventories [Abstract]    
Raw materials $ 21,063,000 $ 20,003,000
Work in process 14,027,000 15,608,000
Finished goods 4,037,000 4,741,000
Inventories, total 39,127,000 40,352,000
Inventory reserve $ 11,000,000 $ 10,100,000