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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Finished goods $ 86,035 $ 85,033
Work-in-process 77,887 71,982
Raw material and supplies 53,274 54,231
Inventories $ 217,196 $ 211,246