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Deferred Preservation Costs And Inventories (Schedule Of Inventories) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventories And Deferred Preservation Costs [Abstract]    
Raw materials and supplies $ 7,942us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves $ 5,706us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Work-in-process 1,006us-gaap_InventoryWorkInProcessNetOfReserves 767us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 3,791us-gaap_InventoryFinishedGoodsNetOfReserves 3,298us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventories $ 12,739us-gaap_InventoryNet $ 9,771us-gaap_InventoryNet