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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Other (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 26, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Other information |  |  |  |
Cash settlement of grants |  |  | $ 2,490 |
ARLP LTIP |  |  |  |
Other information |  |  |  |
Unit-based compensation expense |  | $ 5,400 | 8,100 | $ 10,400
Reduction in compensation expense |  |  | 1,000 |
Total unit-based obligation recorded |  | 6,700 | $ 1,300 |
Unrecognized compensation expense (in dollars) |  | $ 10,800 |  |
Weighted-average period for recognition of expense |  | 1 year 7 months 6 days |  |
Additional grants authorized (in units) | 694,919 |  |  |
2018 Grants | ARLP LTIP |  |  |  |
Other information |  |  |  |
Incremental compensation cost |  | $ 5,400 |  |
2019 Grants | ARLP LTIP |  |  |  |
Other information |  |  |  |
Reversal of cumulative previously recognized expenses |  | $ 4,800 |  |

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