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Inventories (Schedule Of Components Of Inventories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory, Net [Abstract]    
Finished goods $ 28,755 $ 24,938
Work-in-process 14,957 15,648
Raw materials 29,745 33,741
Stores, supplies and other 19,902 19,483
Total $ 93,359 $ 93,810