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Inventories (Schedule Of Inventories) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory, Net [Abstract]    
Finished goods $ 24,938 $ 20,281
Work-in-process 15,648 11,958
Raw materials 33,741 35,909
Stores, supplies and other 19,483 18,759
Total $ 93,810 $ 86,907