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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
EARNINGS PER LIMITED PARTNER UNIT        
NET INCOME ATTRIBUTABLE TO ARLP $ 153,699 $ 167,708 $ 514,674 $ 369,319
General partner's interest in net income attributable to ARLP   (3,101) (1,384) (6,582)
Limited partners' interest in net income attributable to ARLP 153,699 164,607 513,290 362,737
Distributions to participating securities (2,414) (2,180) (7,242) (5,452)
Undistributed earnings attributable to participating securities (1,652) (3,275) (6,596) (6,504)
Net income (loss) attributable to ARLP available to limited partners $ 149,633 $ 159,152 $ 499,452 $ 350,781
Weighted-average limited partner units outstanding - basic (in units) 127,125,437 127,195,219 127,198,805 127,195,219
Weighted-average limited partner units outstanding - diluted (in units) 127,125,000 127,195,000 127,199,000 127,195,000
Earnings per limited partner unit - basic (in dollars per unit) $ 1.18 $ 1.25 $ 3.93 $ 2.76
Earnings per limited partner unit - diluted (in dollars per unit) $ 1.18 $ 1.25 $ 3.93 $ 2.76
Anti-dilutive under the treasury stock method (in units) 2,759,000 3,754,000 2,878,000 3,431,000