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PREPAID EXPENSES AND OTHER - Prepaid Expenses and Other Current Assets (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Chassis converter pool agreements $ 14,661,000 $ 17,767,000
Assets held for sale 350,000 1,897,000
Income tax receivables 11,054,000 18,073,000
Restricted cash 1,670,000 0
Insurance premiums & maintenance/subscription agreements 8,226,000 4,384,000
Commodity swap contracts 39,621,000 13,750,000
All other 4,087,000 7,165,000
Prepaid expenses and other current assets 79,669,000 63,036,000
Restricted cash $ 1,700,000 $ 0