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Earnings per Limited Partner Unit (Tables) | 6 Months Ended
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Jun. 30, 2025
Earnings Per Share [Abstract] |
Reconciliation of net income (loss) and EPU calculations |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
​ | ​ | (in thousands, except per unit data) | ​
Net income attributable to ARLP | ​ | $ | 59,410 | ​ | $ | 100,187 | ​ | $ | 133,393 | ​ | $ | 258,244 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Distributions to participating securities | ​ |  | (719) | ​ |  | (1,688) | ​ |  | (1,545) | ​ |  | (3,368) | ​
Undistributed earnings attributable to participating securities | ​ |  | — | ​ |  | (164) | ​ |  | — | ​ |  | (1,518) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income attributable to ARLP available to limited partners | ​ | $ | 58,691 | ​ | $ | 98,335 | ​ | $ | 131,848 | ​ | $ | 253,358 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average limited partner units outstanding – basic and diluted | ​ |  | 128,428 | ​ |  | 128,062 | ​ |  | 128,347 | ​ |  | 127,866 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings per limited partner unit - basic and diluted (1) | ​ | $ | 0.46 | ​ | $ | 0.77 | ​ | $ | 1.03 | ​ | $ | 1.98 | ​
(1) | Diluted EPU gives effect to all potentially dilutive common units outstanding during the period using the treasury stock method. Diluted EPU excludes all potentially dilutive units calculated under the treasury stock method if their effect is anti-dilutive. For the three and six months ended June 30, 2025, participating securities of 605 and 715, respectively, were considered anti-dilutive under the treasury stock method. For the three and six months ended June 30, 2024, participating securities of 1,726 and 1,945, respectively, were considered anti-dilutive under the treasury stock method.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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