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EARNINGS PER LIMITED PARTNER UNIT - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
EARNINGS PER LIMITED PARTNER UNIT
Net income (loss) attributable to ARLP	$ 24,748	$ (144,783)
Distributions to participating securities	(218)
Undistributed earnings attributable to participating securities	(200)
Net income (loss) attributable to ARLP available to limited partners	$ 24,330	$ (144,783)
Weighted-average limited partner units outstanding - basic and diluted	127,195,219	127,072,308
Earnings per limited partner unit - basic and diluted	$ 0.19	$ (1.14)
Anti-dilutive under the treasury stock method (in units)	1,237,000	851,000

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