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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
EARNINGS PER LIMITED PARTNER UNIT        
Net income attributable to ARLP $ 164,607 $ 57,548 $ 362,737 $ 126,331
Distributions to participating securities (2,180) (765) (5,452) (1,384)
Undistributed earnings attributable to participating securities (3,275) (951) (6,504) (1,832)
Net income attributable to ARLP available to limited partners $ 159,152 $ 55,832 $ 350,781 $ 123,115
Weighted-average limited partner units outstanding - basic (in units) 127,195,219 127,195,219 127,195,219 127,195,219
Weighted-average limited partner units outstanding - diluted (in units) 127,195,000 127,195,000 127,195,000 127,195,000
Earnings per limited partner unit - basic (in dollars per unit) $ 1.25 $ 0.44 $ 2.76 $ 0.97
Earnings per limited partner unit - diluted (in dollars per unit) $ 1.25 $ 0.44 $ 2.76 $ 0.97
Anti-dilutive under the treasury stock method (in units) 3,754,000 2,328,000 3,431,000 1,706,000