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Deferred Preservation Costs And Inventories (Schedule Of Inventories) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Deferred Preservation Costs And Inventories [Abstract]    
Raw materials and supplies $ 7,041 $ 5,706
Work-in-process 982 767
Finished goods 4,066 3,298
Total inventories $ 12,089 $ 9,771