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REVENUE - Coal Operations (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) T	Sep. 30, 2023 USD ($)
Coal Operations [Member]
Disaggregation of Revenue [Line Items]
Revenues | $	$ 31,662	$ 97,420	$ 114,093	$ 280,596
Remaining volume performance obligations			3.0
2025
Disaggregation of Revenue [Line Items]
Remaining volume performance obligations			1.0
2026
Disaggregation of Revenue [Line Items]
Remaining volume performance obligations			1.0
2027
Disaggregation of Revenue [Line Items]
Remaining volume performance obligations			1.0
INDIANA | Coal Operations [Member]
Disaggregation of Revenue [Line Items]
Revenues | $	13,338	32,137	$ 46,490	115,787
Florida, North Carolina, Alabama and Georgia [Member] | Coal Operations [Member]
Disaggregation of Revenue [Line Items]
Revenues | $	$ 18,324	$ 65,283	$ 67,603	$ 164,809

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