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Inventories And Deferred Preservation Costs (Schedule Of Inventories) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventories And Deferred Preservation Costs [Abstract]    
Raw materials and supplies $ 16,762 $ 17,381
Work-in-process 4,487 3,858
Finished goods 22,875 24,239
Total inventories $ 44,124 $ 45,478