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EARNINGS PER LIMITED PARTNER UNIT (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
EARNINGS PER LIMITED PARTNER UNIT      
NET INCOME ATTRIBUTABLE TO ARLP $ 630,118 $ 586,200 $ 182,771
General partner's interest in net income attributable to ARLP (1,384) (9,010) (4,614)
Limited partners' interest in net income attributable to ARLP 628,734 577,190 178,157
Distributions to participating securities (9,688) (8,527) (2,334)
Undistributed earnings attributable to participating securities (7,203) (10,576) (2,403)
Net income (loss) attributable to ARLP available to limited partners $ 611,843 $ 558,087 $ 173,420
Weighted-average limited partner units outstanding - basic (in units) 127,180,312 127,195,219 127,195,219
Weighted-average limited partner units outstanding - diluted (in units) 127,180,000 127,195,000 127,195,000
Earnings per limited partner unit - basic (in dollars per unit) $ 4.81 $ 4.39 $ 1.36
Earnings per limited partner unit - diluted (in dollars per unit) $ 4.81 $ 4.39 $ 1.36
Anti-dilutive under the treasury stock method (in units) 2,922,384 3,540,385 1,967,672