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LONG-TERM DEBT - Credit Facility (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 13, 2023
Dec. 31, 2023
Dec. 31, 2021
Mar. 09, 2020
Long-Term Debt        
Debt issuance costs incurred   $ 12,376 $ 113  
Credit Agreement        
Long-Term Debt        
Maximum borrowing capacity $ 425,000      
Minimum liquidity to extend maturity $ 200,000      
Periodic payments (as a percent) 6.25%      
Debt issuance costs incurred   $ 12,400    
Interest coverage ratio 3.0      
Actual cash flow to interest expense ratio for trailing twelve months   63.86    
ARLP debt arrangements requirements, period over which the ratios are required to be maintained   12 months    
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   0.08    
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   0.46    
Letters of credit subfacility        
Long-Term Debt        
Maximum borrowing capacity $ 425,000      
Swingline subfacility        
Long-Term Debt        
Maximum borrowing capacity 15,000      
Term loan        
Long-Term Debt        
Maximum borrowing term loan $ 75,000      
Term loan | Three-month term rate        
Long-Term Debt        
Effective interest rate (as a percent)   8.50%    
Revolving credit facility        
Long-Term Debt        
Maximum borrowing capacity       $ 459,500
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   $ 797,200    
Other        
Long-Term Debt        
Maximum borrowing capacity   5,000    
Letters of credit outstanding   $ 5,000