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COMPENSATION PLANS - LTIP Other Information (Details) - ARLP LTIP - USD ($) $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 22, 2022 | Feb. 10, 2020 | Jan. 23, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other information |  |  |  |  |  |
Unit-based compensation expense |  |  |  | $ 10.4 | $ 10.8 | $ 11.0
Total unit-based obligation recorded |  |  |  | 20.2 | $ 20.8 |
Unrecognized compensation expense (in dollars) |  |  |  | $ 12.5 |  |
Weighted-average period for recognition of expense |  |  |  | 1 year 2 months 12 days |  |
Units for which vesting requirements were deemed satisfied |  |  |  | 885,381 | 331,502 | 350,516
Forfeitures (in units) |  |  |  | 21,476 | 45,749 | 35,516
Common units issued upon vesting |  |  |  | 596,650 | 191,858 | 222,011
Units available for grant |  |  |  | 1,000,000.0 |  |
Units granted |  |  |  | 682,155 | 511,305 | 475,310
2017 Grants |  |  |  |  |  |
Other information |  |  |  |  |  |
Units for which vesting requirements were deemed satisfied |  |  | 424,486 |  |  |
Forfeitures (in units) |  |  | 50,824 |  |  |
Common units issued upon vesting |  | 279,622 |  |  |  |
Additional grants authorized (in units) | 965,035 |  |  |  |  |
Units granted | 950,035 |  |  |  |  |

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