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Prepaid expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Chassis converter pool agreements $ 16,653 $ 18,326  
Assets held for sale 16,631 10,777  
Income tax receivables 15,086 10,821  
Restricted cash 5,618 0 $ 0
Insurance premiums & maintenance agreements 3,937 6,860  
All other 14,633 10,515  
Prepaid Expense and Other Assets, Current $ 72,558 $ 57,299