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