INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred income tax assets:
Insurance and claims accruals	$ 59,275	$ 55,233
Compensation-related accruals	10,767	12,203
Allowance for uncollectible accounts	3,218	3,958
Operating lease liabilities	10,324	7,033
Other	981	1,644
Gross deferred income tax assets	84,565	80,071
Deferred income tax liabilities:
Property and equipment	344,896	305,002
Investments in equity securities	12,818	10,985
Prepaid expenses	7,526	7,269
Operating lease right-of-use assets	10,056	6,955
Investment in partnership	19,745	17,076
Other	2,802	1,283
Gross deferred income tax liabilities	397,843	348,570
Net deferred income tax liability	$ 313,278	$ 268,499