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EARNINGS PER LIMITED PARTNER UNIT - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
EARNINGS PER LIMITED PARTNER UNIT
Net income (loss) attributable to ARLP	$ 178,157	$ (129,220)	$ 399,414
Distributions to participating securities	(2,334)		(4,254)
Undistributed earnings attributable to participating securities	(2,403)		(2,237)
Net income (loss) attributable to ARLP available to limited partners	$ 173,420	$ (129,220)	$ 392,923
Weighted-average limited partner units outstanding - basic (in units)	127,195,219	127,164,659	128,116,670
Earnings per limited partner unit - basic (in dollars per unit)	$ 1.36	$ (1.02)	$ 3.07
Anti-dilutive under the treasury stock method (in units)	1,967,672	773,664	1,284,013

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