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COMPENSATION PLANS - LTIP Other Information (Details) - ARLP LTIP - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jan. 01, 2020
Other information |  |  |  |  |
Unit-based compensation expense | $ 1.6 | $ 2.7 | $ 0.9 | $ 5.1 |
Reversal of cumulative previously recognized expenses |  |  | 4.8 |  |
Total unit-based obligation recorded | 9.7 |  | $ 9.7 |  |
Units expected to vest (in units) |  |  | 1,439,790 |  |
Units expected to vest (in dollars per units) |  |  | $ 13.33 |  |
Intrinsic value of unvested units | 4.7 |  | $ 4.7 |  |
Unrecognized compensation expense (in dollars) | $ 9.5 |  | $ 9.5 |  |
Weighted-average period for recognition of expense |  |  | 1 year 9 months 18 days |  |
Units available for grant | 1,700,000 |  | 1,700,000 |  | 1,000,000.0
Units for which vesting requirements were deemed satisfied |  |  | 424,486 |  |
Forfeitures (in units) |  |  | 13,835 |  |
Common units issued upon vesting |  |  | 279,622 |  |
Units granted |  |  | 950,035 |  |

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