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BUSINESS ACQUISITION - Schedule of Unaudited Pro Forma Financial Information (Details) - FirstFleet - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Business Combination [Line Items]
Operating revenues	$ 858,382	$ 866,103
Net income (loss)	$ 8,648	$ (13,585)
Earnings (loss) per share - basic (in dollars per share)	$ 0.14	$ (0.22)
Earnings (loss) per share - basic - diluted (in dollars per share)	$ 0.14	$ (0.22)

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