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Inventories (Schedule Of Inventories) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory, Net [Abstract]    
Finished goods $ 20,281 $ 16,215
Work-in-process 11,958 8,590
Raw materials 35,909 23,733
Stores, supplies and other 18,759 17,531
Total $ 86,907 $ 66,069