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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventories [Abstract]    
Finished goods $ 45,734 $ 53,009
Work-in-process 891 1,112
Raw materials and supplies 7,429 6,543
Inventories $ 54,054 $ 60,664