XML 80 R65.htm IDEA: XBRL DOCUMENT v3.8.0.1
Inventories (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosures [Line Items]    
Consignment inventory $ 14.1 $ 19.3
United States    
Inventory Disclosures [Line Items]    
Consignment inventory, percentage 90.00%  
Canada    
Inventory Disclosures [Line Items]    
Consignment inventory, percentage 80.00%