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Inventories And Deferred Preservation Costs (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Inventory [Line Items]    
Consignment inventory $ 11.3 $ 11.2
Domestic [Member]    
Inventory [Line Items]    
Consignment inventory percentage 54.00% 55.00%
Foreign [Member]    
Inventory [Line Items]    
Consignment inventory percentage 46.00% 45.00%