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EARNINGS PER LIMITED PARTNER UNIT - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Net income (loss) attributable to ARLP | $ (129,220) | $ 399,414 | $ 366,604
General partners' equity ownership |  |  | (1,560)
LIMITED PARTNERS | (129,220) | 399,414 | 365,044
Distributions to participating securities |  | (4,254) | (5,114)
Undistributed earnings attributable to participating securities |  | (2,237) | (1,641)
Net income (loss) attributable to ARLP available to limited partners | $ (129,220) | $ 392,923 | $ 358,289
Weighted-average limited partner units outstanding - basic and diluted | 127,164,659 | 128,116,670 | 130,758,169
Earnings per limited partner unit - basic and diluted | $ (1.02) | $ 3.07 | $ 2.74
Anti-dilutive under the treasury stock method (in units) | 773,664 | 1,284,013 | 1,658,908
MGP | Intermediate Partnership |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Ownership percentage by general partners | 1.0001% |  |
MGP | Alliance Coal |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Ownership percentage by general partners | 0.001% |  |

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