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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Finished goods $ 43,364 $ 48,233
Work-in-process 6,222 6,051
Raw materials 32,792 30,315
Total $ 82,378 $ 84,599