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Inventories (Schedule Of Components Of Inventories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Inventory, Net [Abstract]    
Finished goods $ 15,526 $ 17,559
Work-in-process 10,586 10,089
Raw materials 25,644 25,227
Stores, supplies and other 21,644 21,433
Total $ 73,400 $ 74,308