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LONG-TERM DEBT - Credit Facility (Details) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 13, 2023 USD ($) | Mar. 09, 2020 USD ($) | Dec. 31, 2022 USD ($)
Credit Agreement |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity | $ 425.0 |  |
Minimum liquidity to extend maturity | $ 200.0 |  |
Interest rate (as a percent) | 6.25% |  |
Interest coverage ratio | 3.0 |  |
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 |  |  |
Long-Term Debt |  |  |
ARLP debt arrangements requirements, debt to cash flow ratio | 1.5 |  |
Credit Agreement | Alliance Coal and Intermediate Partnership |  |  |
Long-Term Debt |  |  |
ARLP debt arrangements requirements, debt to cash flow ratio | 2.5 |  |
Letters of credit subfacility |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity | $ 425.0 | $ 125.0 |
Swingline subfacility |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity | 15.0 | 15.0 |
Term Loan |  |  |
Long-Term Debt |  |  |
Maximum borrowing term loan | $ 75.0 |  |
Replaced credit facility |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity |  | $ 459.5 |
Letters of credit outstanding |  |  | $ 41.1
Debt available for borrowing |  |  | $ 418.4
Annual commitment fee percentage, undrawn portion |  |  | 0.35%
ARLP debt arrangements requirements, debt to cash flow ratio |  | 2.5 |
ARLP debt arrangements requirements, cash flow to interest expense ratio |  | 3.0 |
Actual debt to cash flow ratio for trailing twelve months |  |  | 0.52
Actual cash flow to interest expense ratio for trailing twelve months |  |  | 21.76
Restricted net assets of subsidiaries |  |  | $ 537.3
Replaced credit facility | Eurodollar Rate |  |  |
Long-Term Debt |  |  |
Effective interest rate (as a percent) |  |  | 6.74%
Replaced credit facility | Credit Agreement, first lien |  |  |
Long-Term Debt |  |  |
ARLP debt arrangements requirements, debt to cash flow ratio |  | 1.5 |
Actual debt to cash flow ratio for trailing twelve months |  |  | 0.03
Other |  |  |
Long-Term Debt |  |  |
Maximum borrowing capacity |  |  | $ 5.0
Letters of credit outstanding |  |  | $ 5.0

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