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ACCRUED EXPENSES (Tables) | 12 Months Ended
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Dec. 31, 2021
ACCRUED EXPENSES. |
Schedule of accrued expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31 | ​
​ |  | 2021 |  | 2020 | ​
​ | ​ | (in thousands) | ​
Workers’ compensation, third-party casualty, and loss and damage claims reserves | ​ | $ | 116,535 | ​ | $ | 103,898 | ​
Accrued vacation pay | ​ |  | 52,746 | ​ |  | 51,728 | ​
Accrued compensation, including retirement benefits | ​ | ​ | 110,755 | ​ | ​ | 67,690 | ​
Taxes other than income | ​ |  | 10,225 | ​ |  | 10,468 | ​
Other | ​ |  | 15,590 | ​ |  | 12,962 | ​
Total accrued expenses | ​ | $ | 305,851 | ​ | $ | 246,746 | ​

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