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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Other (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 28, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other information |  |  |  |
Cash settlement of grants |  | $ 21,786 |  |
ARLP LTIP |  |  |  |
Other information |  |  |  |
Unit-based compensation expense |  | 8,300 | $ 10,400 | $ 9,400
Total unit-based obligation recorded |  | 16,900 | $ 19,500 |
Unrecognized compensation expense (in dollars) |  | $ 8,800 |  |
Weighted-average period for recognition of expense |  | 1 year 6 months |  |
Additional grants authorized (in units) | 354,261 |  |  |
Units granted | 341,137 | 455,574 | 450,125 | 769,907

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- Definition Amount of partnership capital allocated for share-based obligations. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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