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Other Receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Other Receivables    
Other receivables $ 16,253 $ 21,934
Loans to customers to finance vehicle purchases    
Other Receivables    
Other receivables 6,896 7,416
Accrued customer billings    
Other Receivables    
Other receivables 6,328 4,308
Fuel tax credits    
Other Receivables    
Other receivables 0 6,358
Other    
Other Receivables    
Other receivables $ 3,029 $ 3,852