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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventories on a FIFO basis [Abstract]    
Raw materials $ 8,900 $ 7,483
Work in process 13,790 12,996
Finished manufactured goods 23,526 18,850
Total inventories $ 46,216 $ 39,329