INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred income tax assets:
Insurance and claims accruals	$ 51,503	$ 57,666
Compensation-related accruals	10,702	10,146
Allowance for uncollectible accounts	2,158	1,918
Foreign tax credit carryforward	5,015	2,770
Operating lease liabilities	10,555	12,484
State net operating losses	4,910	446
Valuation allowance (State net operating losses)	(1,440)	0
Other	1,707	373
Gross deferred income tax assets	85,110	85,803
Deferred income tax liabilities:
Property and equipment	304,766	305,089
Investments in equity securities	14,833	14,109
Prepaid expenses	7,449	6,391
Operating lease right-of-use assets	10,066	12,028
Investment in partnership	8,092	14,805
Other	6,113	2,897
Gross deferred income tax liabilities	351,319	355,319
Net deferred income tax liability	$ 266,209	$ 269,516