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Inventories (Schedule Of Inventories) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventory, Net [Abstract]    
Finished goods $ 16,215 $ 13,935
Work-in-process 8,590 9,249
Raw materials 23,733 22,149
Stores, supplies and other 17,531 19,992
Total $ 66,069 $ 65,325