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EARNINGS PER LIMITED PARTNER UNIT - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
EARNINGS PER LIMITED PARTNER UNIT
Net income (loss) attributable to ARLP	$ 44,035	$ (46,664)	$ 68,783	$ (191,447)
Distributions to participating securities	(401)		(619)
Undistributed earnings attributable to participating securities	(825)		(934)
Net income (loss) attributable to ARLP available to limited partners	$ 42,809	$ (46,664)	$ 67,230	$ (191,447)
Weighted-average limited partner units outstanding - basic and diluted	127,195,219	127,195,219	127,195,219	127,133,764
Earnings per limited partner unit - basic and diluted	$ 0.34	$ (0.37)	$ 0.53	$ (1.51)
Anti-dilutive under the treasury stock method (in units)	1,525,000	661,000	1,397,000	654,000

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