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Inventories And Deferred Preservation Costs (Schedule Of Inventories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventories And Deferred Preservation Costs [Abstract]    
Raw materials and supplies $ 25,828 $ 21,180
Work-in-process 6,927 5,127
Finished goods 29,953 26,764
Total inventories $ 62,708 $ 53,071