XML 88 R49.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Inventories And Deferred Preservation Costs (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Inventory [Line Items]    
Consignment inventory $ 12.0 $ 11.2
Domestic [Member]    
Inventory [Line Items]    
Consignment inventory percentage 51.00% 55.00%
Foreign [Member]    
Inventory [Line Items]    
Consignment inventory percentage 49.00% 45.00%