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EARNINGS PER LIMITED PARTNER UNIT (Tables) | 12 Months Ended
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Dec. 31, 2021
EARNINGS PER LIMITED PARTNER UNIT |
Reconciliation of net income and EPU calculations |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, | ​
​ |  | 2021 |  | 2020 |  | 2019 | ​
​ | ​ | (in thousands, except per unit data) | ​
Net income (loss) attributable to ARLP | ​ | $ | 178,157 | ​ | $ | (129,220) | ​ | $ | 399,414 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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 and diluted | ​ |  | 127,195 | ​ |  | 127,165 | ​ |  | 128,117 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings per limited partner unit - basic and diluted (1) | ​ | $ | 1.36 | ​ | $ | (1.02) | ​ | $ | 3.07 | ​
(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 years ended December 31, 2021, 2020 and 2019, the combined total of LTIP, SERP and Directors' Deferred Compensation Plan units of 1,967,672, 773,664 and 1,284,013, 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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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