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Inventories (Schedule Of Components Of Inventories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventory, Net [Abstract]    
Finished goods $ 13,018 $ 13,935
Work-in-process 10,754 9,249
Raw materials 22,515 22,149
Stores, supplies and other 20,393 19,992
Total $ 66,680 $ 65,325