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EARNINGS PER LIMITED PARTNER UNIT - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
EARNINGS PER LIMITED PARTNER UNIT |  |  |
Net income (loss) attributable to ARLP | $ 178,157 | $ (129,220) | $ 399,414
Distributions to participating securities | (2,334) |  | (4,254)
Undistributed earnings attributable to participating securities | (2,403) |  | (2,237)
Net income (loss) attributable to ARLP available to limited partners | $ 173,420 | $ (129,220) | $ 392,923
Weighted-average limited partner units outstanding - basic (in units) | 127,195,219 | 127,164,659 | 128,116,670
Earnings per limited partner unit - basic (in dollars per unit) | $ 1.36 | $ (1.02) | $ 3.07
Anti-dilutive under the treasury stock method (in units) | 1,967,672 | 773,664 | 1,284,013

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