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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred income tax assets: |  |
Insurance and claims accruals | $ 57,168 | $ 59,275
Compensation-related accruals | 9,931 | 10,767
Allowance for uncollectible accounts | 2,797 | 3,218
Operating lease liabilities | 8,733 | 10,324
Other | 2,235 | 981
Gross deferred income tax assets | 80,864 | 84,565
Deferred income tax liabilities: |  |
Property and equipment | 351,352 | 344,896
Investments in equity securities | 12,240 | 12,818
Prepaid expenses | 7,118 | 7,526
Operating lease right-of-use assets | 8,327 | 10,056
Investment in partnership | 18,790 | 19,745
Other | 3,217 | 2,802
Gross deferred income tax liabilities | 401,044 | 397,843
Net deferred income tax liability | $ 320,180 | $ 313,278

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