XML 71 R59.htm IDEA: XBRL DOCUMENT v3.8.0.1
Credit Risk (Details) - Accounts Receivable [Member] - Credit Concentration Risk [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2016
Ford And Affiliates [Member]    
Concentration Risk [Line Items]    
Entity-wide revenue, major customer, percentage 29.00% 28.00%
Mazda [Member]    
Concentration Risk [Line Items]    
Entity-wide revenue, major customer, percentage 17.00% 17.00%
Nissan\Renault [Member]    
Concentration Risk [Line Items]    
Entity-wide revenue, major customer, percentage 13.00% 14.00%