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Credit Risk (Details) - Accounts Receivable [Member] - Credit Concentration Risk [Member]
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2016
Ford And Affiliates [Member]    
Concentration Risk [Line Items]    
Entity-wide revenue, major customer, percentage 25.00% 28.00%
Mazda [Member]    
Concentration Risk [Line Items]    
Entity-wide revenue, major customer, percentage 18.00% 17.00%
Nissan\Renault [Member]    
Concentration Risk [Line Items]    
Entity-wide revenue, major customer, percentage 13.00% 14.00%