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EARNINGS PER LIMITED PARTNER UNIT (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
EARNINGS PER LIMITED PARTNER UNIT |  |
NET INCOME ATTRIBUTABLE TO ARLP | $ 158,057 | $ 191,185
General partner's interest in net income attributable to ARLP |  | (1,384)
Limited partners' interest in net income attributable to ARLP | 158,057 | 189,801
Distributions to participating securities | (1,680) | (2,432)
Undistributed earnings attributable to participating securities | (1,448) | (2,979)
Net income (loss) attributable to ARLP available to limited partners | $ 154,929 | $ 184,390
Weighted-average limited partner units outstanding - basic (in units) | 127,670,897 | 127,289,340
Weighted-average limited partner units outstanding - diluted (in units) | 127,671,000 | 127,289,000
Earnings per limited partner unit - basic (in dollars per unit) | $ 1.21 | $ 1.45
Earnings per limited partner unit - diluted (in dollars per unit) | $ 1.21 | $ 1.45
Anti-dilutive under the treasury stock method (in units) | 2,175,000 | 3,147,000

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