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Prepaid expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Chassis converter pool agreements $ 13,883 $ 18,326  
Insurance premiums & maintenance agreements 7,861 6,860  
Assets held for sale 7,200 10,777  
Restricted cash 6,412 0 $ 3,072
Income tax receivables 5,041 10,821  
All other 14,770 10,515  
Prepaid Expense and Other Assets, Current $ 55,167 $ 57,299