v3.25.2
REVENUE - Coal Operations (Details) - Coal Operations - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Revenues $ 38,147 $ 32,801 $ 68,332 $ 82,431
INDIANA        
Disaggregation of Revenue [Line Items]        
Revenues 21,290 15,048 41,604 33,152
Florida, North Carolina, Alabama and Georgia        
Disaggregation of Revenue [Line Items]        
Revenues $ 16,857 $ 17,753 $ 26,728 $ 49,279