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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 |

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