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Inventories (Schedule Of Components Of Inventories) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory, Net [Abstract]    
Finished goods $ 22,638 $ 24,938
Work-in-process 13,565 15,648
Raw materials 29,014 33,741
Stores, supplies and other 20,098 19,483
Total $ 85,315 $ 93,810