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PREPAID EXPENSES - Prepaid Expenses and Other Current Assets (Details) - USD ($)
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Chassis converter pool agreements $ 23,957,000   $ 22,273,000
Assets held for sale 3,009,000   3,039,000
Income tax receivables 6,487,000   9,872,000
Insurance premiums & maintenance agreements 10,778,000   3,313,000
All other 10,616,000   12,764,000
Prepaid expenses and other current assets $ 54,847,000   51,261,000
Restricted cash   $ 0 $ 0