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COMPENSATION PLANS - LTIP Other Information (Details) - ARLP LTIP - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Jan. 01, 2020
Other information |  |  |
Unit-based compensation expense | $ (0.7) | $ 2.4 |
Reversal of cumulative previously recognized expenses | 4.8 |  |
Total unit-based obligation recorded | $ 8.1 |  |
Units expected to vest (in units) | 1,446,417 |  |
Units expected to vest (in dollars per units) | $ 13.33 |  |
Intrinsic value of unvested units | $ 4.5 |  |
Unrecognized compensation expense (in dollars) | $ 11.2 |  |
Weighted-average period for recognition of expense | 2 years 1 month 6 days |  |
Units available for grant | 1,700,000 |  | 1,000,000.0
Units for which vesting requirements were deemed satisfied | 424,486 |  |
Forfeitures (in units) | 6,828 |  |
Common units issued upon vesting | 279,622 |  |
Units granted | 951,829 |  |

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