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EARNINGS PER LIMITED PARTNER UNIT - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
EARNINGS PER LIMITED PARTNER UNIT
Net income (loss) attributable to ARLP	$ 57,548	$ 27,199	$ 126,331	$ (164,248)
Distributions to participating securities	(765)		(1,384)
Undistributed earnings attributable to participating securities	(951)	(581)	(1,832)
Net income (loss) attributable to ARLP available to limited partners	$ 55,832	$ 26,618	$ 123,115	$ (164,248)
Weighted-average limited partner units outstanding - basic and diluted	127,195,219	127,195,219	127,195,219	127,154,398
Earnings per limited partner unit - basic and diluted	$ 0.44	$ 0.21	$ 0.97	$ (1.29)
Anti-dilutive under the treasury stock method (in units)	2,328,000	661,000	1,706,000	656,000

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