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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventories on a FIFO basis [Abstract]    
Raw materials $ 9,658 $ 7,483
Work in process 14,579 12,996
Finished manufactured goods 21,589 18,850
Total inventories $ 45,826 $ 39,329