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ACCRUED EXPENSES (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Accrued insurance, employee medical insurance costs $ 9.4 $ 14.3
Accrual loss for workers' compensation, comprehensive general liability and vehicle liability self-insurance programs 65.6 $ 59.4
Increase in payroll tax payable 17.0  
Decrease in accrued payroll 4.8  
Decrease In accrued bonuses $ 3.5