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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Grants (Details) - ARLP LTIP - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 26, 2022 | Dec. 31, 2020 | Feb. 29, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017 | Apr. 30, 2021 | Dec. 31, 2018
Number of units |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in units) |  |  |  |  | 1,430,489 |  | 1,603,378 | 1,828,080 |  |  |  |
Granted (in units) |  | 687,719 |  |  | 1,818,190 | [1] | 1,430,489 | 682,155 |  | 424,486 |  |
Vested (in units) |  |  |  |  |  |  | (919,524) | (885,381) | [2] |  |  |
Grants canceled (in units) | [2] |  |  |  |  |  | (675,302) |  |  |  |  |
Forfeited (in units) |  |  |  |  | (118,204) |  | (8,552) | (21,476) |  |  |  |
Balance at the end of the period (in units) |  |  | 1,430,489 |  | 3,130,475 |  | 1,430,489 | 1,603,378 |  |  |  |
Weighted average grant date fair value per unit |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in dollars per unit) |  |  |  |  | $ 5.02 |  | $ 20.39 | $ 17.18 |  |  |  |
Granted (in dollars per unit) |  |  |  |  | 6.03 | [1] | 5.02 | 18.63 |  |  |  |
Vested (in dollars per unit) |  |  |  |  |  |  | $ 21.70 | 12.38 | [2] |  |  |
Grants canceled (in dollars per unit) | [2] |  |  |  |  |  | 18.62 |  |  |  |  |
Forfeited (in dollars per unit) |  |  |  |  | 5.48 |  | $ 20.16 | 20.84 |  |  |  |
Balance at the end of the period (in dollars per unit) |  |  | $ 5.02 |  | $ 5.59 |  | $ 5.02 | $ 20.39 |  |  |  |
Intrinsic value (in dollars) |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of outstanding grants (in dollars) |  |  | $ 6,409 |  | $ 39,569 |  | $ 6,409 | $ 17,349 |  |  |  | $ 31,699
Other information |  |  |  |  |  |  |  |  |  |  |  |
Common units issued |  |  |  | 279,622 |  |  |  | 596,650 |  |  |  |
First Specified Minimum Guarantee |  |  |  |  |  |  |  |  |  |  |  |
Other information |  |  |  |  |  |  |  |  |  |  |  |
Guaranteed minimum (in shares) |  |  |  |  |  |  |  |  |  |  | 921,430 |
Guaranteed minimum (in dollars per unit) |  | $ 9.62 |  |  |  |  |  |  |  |  | $ 2.53 |
Second Specified Minimum Guarantee |  |  |  |  |  |  |  |  |  |  |  |
Other information |  |  |  |  |  |  |  |  |  |  |  |
Guaranteed minimum (in shares) |  |  |  |  |  |  |  |  |  |  | 896,760 |
Guaranteed minimum (in dollars per unit) |  | $ 6.41 |  |  |  |  |  |  |  |  | $ 3.79 |
2018 Grants |  |  |  |  |  |  |  |  |  |  |  |
Number of units |  |  |  |  |  |  |  |  |  |  |  |
Vested (in units) |  |  | (495,038) |  |  |  |  |  |  |  |  |
2019 Grants |  |  |  |  |  |  |  |  |  |  |  |
Number of units |  |  |  |  |  |  |  |  |  |  |  |
Grants canceled (in units) |  |  | 675,302 |  |  |  |  |  |  |  |  |
2020 Grants |  |  |  |  |  |  |  |  |  |  |  |
Number of units |  |  |  |  |  |  |  |  |  |  |  |
Granted (in units) |  |  | 578,114 |  |  |  |  |  |  |  |  |
[1] | In December 2020, we modified the vesting requirements for certain restricted units that we granted in February 2020 which were determined to be improbable of vesting under the original vesting requirements (the "2020 Grants"). The new vesting requirements make it probable the modified restricted units will vest. Also in December 2020, an additional 578,114 restricted units under these modified vesting requirements were granted. The grant date fair value reflects the modification date fair value for those awards that were modified.
[2] | During the year ended December 31, 2019, we issued 596,650 unrestricted common units to LTIP participants. The remaining vested units were settled in cash to satisfy tax withholding obligations of the LTIP participants.

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