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Long-Term Debt - Credit Facility (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jan. 13, 2023
Jun. 30, 2025
Jun. 30, 2024
Debt Instrument [Line Items]      
Debt issuance costs incurred   $ 0 $ 11,379
Credit Agreement      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 425,000    
Increase of maximum borrowing capacity 100,000    
Minimum liquidity to extend maturity $ 200,000    
Letters of credit outstanding   41,000  
Debt available for borrowing   $ 384,000  
Annual commitment fee percentage, undrawn portion   0.50%  
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   35.07  
Credit Agreement | Overnight Bank Funding Rate      
Debt Instrument [Line Items]      
Basis spread for variable interest rate (as a percent) 0.50%    
Credit Agreement | Daily Simple Secured Overnight Financing Rate      
Debt Instrument [Line Items]      
Basis spread for variable interest rate (as a percent) 1.00%    
Credit Agreement | Alliance Coal      
Debt Instrument [Line Items]      
ARLP debt arrangements requirements, debt to cash flow ratio 1.5    
Actual debt to cash flow ratio for trailing twelve months   0.16  
Credit Agreement | Alliance Coal and Intermediate Partnership      
Debt Instrument [Line Items]      
ARLP debt arrangements requirements, debt to cash flow ratio 2.5    
Actual debt to cash flow ratio for trailing twelve months   1  
Swingline subfacility      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 15,000    
Term loan      
Debt Instrument [Line Items]      
Maximum borrowing term loan $ 75,000    
Interest rate (as a percent) 6.25%    
Effective interest rate (as a percent)   7.68%