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LONG-TERM DEBT - Credit Facility (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 13, 2023
Dec. 31, 2024
Dec. 31, 2023
Long-Term Debt      
Debt issuance costs incurred   $ 11,442 $ 12,376
Credit Agreement      
Long-Term Debt      
Maximum borrowing capacity $ 425,000    
Increase of maximum borrowing capacity 100,000    
Minimum liquidity to extend maturity $ 200,000    
Periodic payments (as a percent) 6.25%    
Debt issuance costs incurred   $ 1,800 $ 12,400
Minimum debt to cash flow ratio for restriction to apply on cash distribution 1    
Interest coverage ratio 3    
Actual cash flow to interest expense ratio for trailing twelve months   37.97  
Credit Agreement | Overnight Bank Funding Rate      
Long-Term Debt      
Basis spread for variable interest rate (as a percent) 0.50%    
Credit Agreement | Daily Simple Secured Overnight Financing Rate      
Long-Term Debt      
Basis spread for variable interest rate (as a percent) 1.00%    
Credit Agreement | Alliance Coal      
Long-Term Debt      
ARLP debt arrangements requirements, debt to cash flow ratio 1.5    
Actual debt to cash flow ratio for trailing twelve months   0.17  
Credit Agreement | Alliance Coal and Intermediate Partnership      
Long-Term Debt      
ARLP debt arrangements requirements, debt to cash flow ratio 2.5    
Actual debt to cash flow ratio for trailing twelve months   0.91  
Swingline subfacility      
Long-Term Debt      
Maximum borrowing capacity $ 15,000    
Term loan      
Long-Term Debt      
Maximum borrowing term loan $ 75,000    
Effective interest rate (as a percent)   7.71%  
Other letters of credit      
Long-Term Debt      
Maximum borrowing capacity   $ 5,000  
Letters of credit outstanding   5,000  
Revolving credit facility      
Long-Term Debt      
Letters of credit outstanding   41,000  
Debt available for borrowing   $ 384,000  
Annual commitment fee percentage, undrawn portion   0.50%  
Restricted net assets of subsidiaries   $ 649,200