XML 65 R52.htm IDEA: XBRL DOCUMENT v3.25.1
LONG-TERM DEBT - Credit Facility (Details) - USD ($)
$ in Millions
 3 Months Ended
Jan. 13, 2023
Mar. 31, 2025
Credit Agreement    
Long-Term Debt    
Maximum borrowing capacity $ 425.0  
Increase of maximum borrowing capacity 100.0  
Minimum liquidity to extend maturity $ 200.0  
Letters of credit outstanding   $ 41.0
Debt available for borrowing   $ 384.0
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   34.52
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   0.98
Swingline subfacility    
Long-Term Debt    
Maximum borrowing capacity $ 15.0  
Term loan    
Long-Term Debt    
Maximum borrowing term loan $ 75.0  
Interest rate (as a percent) 6.25%  
Effective interest rate (as a percent)   7.68%