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Minimum liquidity to extend maturity to full term.

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The contingent increase above the maximum borrowing capacity under the credit facility, if any one or more of the existing banks or new banks agree to provide such increased commitment amount.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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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%