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Inventories And Deferred Preservation Costs (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Inventory [Line Items]    
Consignment inventory $ 5.1 $ 4.9
Domestic [Member]    
Inventory [Line Items]    
Consignment inventory percentage 80.00% 80.00%
Foreign [Member]    
Inventory [Line Items]    
Consignment inventory percentage 20.00% 20.00%