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ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
ACCRUED EXPENSES    
Workers' compensation, third-party casualty, and loss and damage claims reserves $ 103,015 $ 99,969
Accrued vacation pay 41,474 36,034
Accrued compensation 52,626 35,718
Taxes other than income 8,457 8,215
Other 37,539 30,548
Total accrued expenses $ 243,111 $ 210,484