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Inventories (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Inventories [Abstract]    
Raw materials $ 19,873,000 $ 21,063,000
Work in process 14,396,000 14,027,000
Finished goods 3,771,000 4,037,000
Inventories, total 38,040,000 39,127,000
Inventory reserve $ 11,500,000 $ 11,000,000