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Inventories (Schedule Of Components Of Inventories) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Inventory, Net [Abstract]    
Finished goods $ 12,950 $ 17,559
Work-in-process 9,291 10,089
Raw materials 22,070 25,227
Stores, supplies and other 21,200 21,433
Total $ 65,511 $ 74,308