PREPAID EXPENSES - Prepaid Expenses and Other Current Assets (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Restricted Cash	$ 0	$ 0
Chassis converter pool agreements	11,704,000	22,273,000
Assets held for sale	3,009,000	3,039,000
Income tax receivables	205,000	9,872,000
Insurance premiums & maintenance agreements	11,184,000	3,313,000
All other	14,448,000	12,764,000
Prepaid expenses and other current assets	$ 40,550,000	$ 51,261,000