v3.26.1
REVENUE - Coal Operations (Details) - Coal Operations - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
REVENUE        
Revenues $ 40,601 $ 38,147 $ 75,681 $ 68,332
Third-party Indiana customers        
REVENUE        
Revenues 28,701 21,290 54,614 41,604
Other customers        
REVENUE        
Revenues $ 11,900 $ 16,857 $ 21,067 $ 26,728