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Inventories (Schedule Of Components Of Inventories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory, Net [Abstract]    
Finished goods $ 23,986 $ 20,281
Work-in-process 12,420 11,958
Raw materials 29,591 35,909
Stores, supplies and other 18,893 18,759
Total $ 84,890 $ 86,907