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RELATED-PARTY TRANSACTIONS - Affiliate Royalty Agreements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Related Party Transaction      
As of the beginning of period $ 64,599    
As of the end of period 67,189 $ 64,599  
Coal lease      
Related Party Transaction      
As of the beginning of period 64,599 60,608 $ 55,613
Payments 11,249 11,249 11,250
Recoupment (8,659) (7,258) (6,255)
As of the end of period 67,189 64,599 60,608
Tunnel Ridge      
Related Party Transaction      
As of the beginning of period 1,500 1,500 1,500
Payments 3,000 3,000 3,000
Recoupment (3,000) (3,000) (3,000)
As of the end of period 1,500 1,500 1,500
WKY CoalPlay | December 2014 coal lease - Henderson and Union Counties, Kentucky      
Related Party Transaction      
As of the beginning of period 21,431 22,092 21,750
Payments 3,597 3,597 3,597
Recoupment (5,380) (4,258) (3,255)
As of the end of period 19,648 21,431 22,092
WKY CoalPlay | December 2014 coal lease - Henderson County, Kentucky      
Related Party Transaction      
As of the beginning of period 22,693 20,172 17,650
Payments 2,521 2,521 2,522
Recoupment (258)    
As of the end of period 24,956 22,693 20,172
WKY CoalPlay | February 2015 coal lease - Henderson and Union Counties, Kentucky      
Related Party Transaction      
As of the beginning of period 18,975 16,844 14,713
Payments 2,131 2,131 2,131
Recoupment (21)    
As of the end of period $ 21,085 $ 18,975 $ 16,844