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LONG-TERM DEBT - Credit Facility (Details) - USD ($) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Jan. 13, 2023 | Jun. 30, 2024 | Jun. 12, 2024
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 | 1.0 |  |
ARLP debt arrangements requirements, period over which the ratios are required to be maintained |  | 12 months |
Credit Agreement | Maximum |  |  |
Long-Term Debt |  |  |
Interest coverage ratio | 3.0 |  |
Actual cash flow to interest expense ratio for trailing twelve months |  | 49.06 |
Credit Agreement | Minimum |  |  |
Long-Term Debt |  |  |
Interest coverage ratio | 1.0 |  |
Actual cash flow to interest expense ratio for trailing twelve months |  | 1.0 |
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 | Maximum |  |  |
Long-Term Debt |  |  |
ARLP debt arrangements requirements, debt to cash flow ratio | 1.5 | 1.0 |
Credit Agreement | Alliance Coal | Minimum |  |  |
Long-Term Debt |  |  |
ARLP debt arrangements requirements, debt to cash flow ratio | 1.0 |  |
Actual debt to cash flow ratio for trailing twelve months |  | 0.16 |
Credit Agreement | Alliance Coal and Intermediate Partnership | Maximum |  |  |
Long-Term Debt |  |  |
ARLP debt arrangements requirements, debt to cash flow ratio | 2.5 |  |
Actual debt to cash flow ratio for trailing twelve months |  | 1.0 |
Credit Agreement | Alliance Coal and Intermediate Partnership | Minimum |  |  |
Long-Term Debt |  |  |
ARLP debt arrangements requirements, debt to cash flow ratio | 1.0 |  |
Actual debt to cash flow ratio for trailing twelve months |  | 0.78 |
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) |  | 8.70% |
Senior Notes 8.625 Due 2029 [Member] |  |  |
Long-Term Debt |  |  |
Interest rate (as a percent) |  | 8.625% | 8.625%

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