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EARNINGS PER LIMITED PARTNER UNIT - Reconciliation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
EARNINGS PER LIMITED PARTNER UNIT    
NET INCOME ATTRIBUTABLE TO ARLP $ 191,185 $ 38,083
General partner's interest in net income attributable to ARLP (1,384) (1,431)
Limited partners' interest in net income attributable to ARLP 189,801 36,652
Distributions to participating securities (2,432) (1,552)
Undistributed earnings attributable to participating securities (2,979)  
Net income (loss) attributable to ARLP available to limited partners $ 184,390 $ 35,100
Weighted-average limited partner units outstanding - basic (in units) 127,289,340 127,195,219
Weighted-average limited partner units outstanding - diluted (in units) 127,289,000 127,195,000
Earnings per limited partner unit - basic (in dollars per unit) $ 1.45 $ 0.28
Earnings per limited partner unit - diluted (in dollars per unit) $ 1.45 $ 0.28
Anti-dilutive under the treasury stock method (in units) 3,147,000 3,139,000