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REVENUE - Coal Operations (Details) - Coal Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 51,256	$ 31,662	$ 119,588	$ 114,093
INDIANA
Disaggregation of Revenue [Line Items]
Revenues	27,355	13,338	68,960	46,490
Florida, North Carolina, Alabama and Georgia
Disaggregation of Revenue [Line Items]
Revenues	$ 23,901	$ 18,324	$ 50,628	$ 67,603

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