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Inventories And Deferred Preservation Costs (Schedule Of Inventories) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventories And Deferred Preservation Costs [Abstract]    
Raw materials and supplies $ 9,321 $ 8,590
Work-in-process 3,321 633
Finished goods 13,651 5,420
Total inventories $ 26,293 $ 14,643