XML 51 R41.htm IDEA: XBRL DOCUMENT v3.8.0.1
Inventories And Deferred Preservation Costs (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Consignment inventory $ 5.8 $ 4.9
Domestic [Member]    
Inventory [Line Items]    
Consignment inventory percentage 85.00% 80.00%
Foreign [Member]    
Inventory [Line Items]    
Consignment inventory percentage 15.00% 20.00%