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Deferred Preservation Costs And Inventories (Schedule Of Inventories) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Deferred Preservation Costs And Inventories [Abstract]    
Raw materials and supplies $ 6,213 $ 5,706
Work-in-process 807 767
Finished goods 4,469 3,298
Total inventories $ 11,489 $ 9,771