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INVENTORIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
INVENTORIES    
Raw materials $ 21,848 $ 21,859
Work-in-process 12,168 11,212
Finished goods 7,537 6,381
Gross inventories 41,553 39,452
Less: Reserve for excess and obsolete inventory (2,430) (2,309)
Net inventories $ 39,123 $ 37,143