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FAIR VALUE MEASUREMENTS - Level 3 (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024
Changes in contingent consideration liability
Liability, beginning balance	$ 13,100	$ 9,900
Payments	(1,776)	(1,431)
Liability, ending balance	$ 11,324	$ 8,469
Measurement input, Coal price volatility
Fair value measurement input
Contingent consideration, Measurement input	0.062		0.062
Measurement input, Market price of risk adjustment
Fair value measurement input
Contingent consideration, Measurement input	0.062		0.062
Cost of debt | Minimum
Fair value measurement input
Contingent consideration, Measurement input	0.0651		0.0651
Cost of debt | Maximum
Fair value measurement input
Contingent consideration, Measurement input	0.0856		0.0856

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