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ACCRUED EXPENSES (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
ACCRUED EXPENSES.    
Workers' compensation, third-party casualty, and loss and damage claims reserves $ 133,128 $ 116,535
Accrued vacation pay 58,874 52,746
Accrued compensation, including retirement benefits 122,057 110,755
Taxes other than income 12,443 10,225
Other 15,320 15,590
Total accrued expenses $ 341,822 $ 305,851