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ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
ACCRUED EXPENSES    
Workers' compensation, third-party casualty, and loss and damage claims reserves $ 95,784 $ 96,159
Accrued vacation pay 34,939 33,731
Accrued compensation 27,826 27,524
Taxes other than income 8,284 7,971
Other 23,191 23,342
Total accrued expenses $ 190,024 $ 188,727