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Earnings per Limited Partner Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net Income (Loss) $ 95,104 $ 86,281 $ 228,497 $ 344,525
Distributions to participating securities (715) (1,616) (2,260) (4,984)
Undistributed earnings attributable to participating securities (160) 0 0 (1,378)
Net income attributable to ARLP available to limited partners $ 94,229 $ 84,665 $ 226,237 $ 338,163
Weighted-average limited partner units outstanding - basic (in units) 128,428,024 128,061,981 128,374,391 127,932,095
Weighted-average limited partner units outstanding - diluted (in units) 128,428,024 128,061,981 128,374,391 127,932,095
Earnings per limited partner unit - basic (in dollars per unit) $ 0.73 $ 0.66 $ 1.76 $ 2.64
Earnings per limited partner unit - diluted (in dollars per unit) $ 0.73 $ 0.66 $ 1.76 $ 2.64
Anti-dilutive under the treasury stock method (in units) 665,000 1,863,000 703,000 1,915,000