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Inventories And Deferred Preservation Costs (Narrative) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Inventory [Line Items]  
Consignment inventory $ 4.9
Domestic [Member]  
Inventory [Line Items]  
Consignment inventory percentage 80.00%
Foreign [Member]  
Inventory [Line Items]  
Consignment inventory percentage 20.00%