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COMMON UNIT-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2024
ARLP LTIP |
COMMON UNIT-BASED COMPENSATION PLANS |
Summary of non-vested share activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of units |  | Weighted average grant date fair value per unit |  | Intrinsic value |
​ | ​ | ​ | ​ | ​ | ​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-vested grants at January 1, 2022 | ​ | 3,130,475 | ​ | $ | 5.59 | ​ | $ | 39,569 | ​
Granted (1) | ​ | 769,907 | ​ | ​ | 14.65 | ​ | ​ | ​ | ​
Forfeited | ​ | (203,249) | ​ |  | 6.93 | ​ | ​ | ​ | ​
Non-vested grants at December 31, 2022 | ​ | 3,697,133 | ​ | ​ | 7.40 | ​ | ​ | 75,126 | ​
Granted (1) | ​ | 450,125 | ​ | ​ | 21.54 | ​ | ​ | ​ | ​
Vested (2) | ​ | (1,291,330) | ​ |  | 5.02 | ​ | ​ | ​ | ​
Forfeited | ​ | (145,584) | ​ |  | 6.86 | ​ | ​ | ​ | ​
Non-vested grants at December 31, 2023 | ​ | 2,710,344 | ​ | ​ | 10.91 | ​ | ​ | 57,405 | ​
Granted (1) |  | 455,574 | ​ | ​ | 19.69 | ​ | ​ | ​ | ​
Vested (2) |  | (1,582,422) | ​ |  | 6.53 | ​ | ​ | ​ | ​
Forfeited |  | (124,932) | ​ |  | 20.37 | ​ | ​ | ​ | ​
Non-vested grants at December 31, 2024 |  | 1,458,564 | ​ |  | 17.60 | ​ | ​ | 38,346 | ​
(1) | Restricted units granted have certain minimum-value guarantees per unit, regardless of whether the awards vest.
(2) | During the years ended December 31, 2024 and 2023, we issued 936,544 and 860,060 unrestricted common units, respectively, to the LTIP participants. The remaining vested units were settled in cash to satisfy tax withholding obligations.
SERP and Deferred Compensation Plans |
COMMON UNIT-BASED COMPENSATION PLANS |
Summary of activity in share-based plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of units |  | Weighted average fair value per unit |  | Intrinsic value |
​ | ​ | ​ | ​ | ​ | ​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Phantom units outstanding as of January 1, 2022 | ​ | 668,698 | ​ | $ | 20.37 | ​ | $ | 8,452 | ​
Granted | ​ | 73,842 | ​ | ​ | 19.44 | ​ | ​ | ​ | ​
Phantom units outstanding as of December 31, 2022 | ​ | 742,540 | ​ | ​ | 20.28 | ​ | ​ | 15,088 | ​
Granted | ​ | 118,737 | ​ | ​ | 20.46 | ​ | ​ | ​ | ​
Settled (1) | ​ | (49,331) | ​ | ​ | 20.27 | ​ | ​ | ​ | ​
Phantom units outstanding as of December 31, 2023 | ​ | 811,946 | ​ | ​ | 20.44 | ​ | ​ | 17,197 | ​
Granted | ​ | 100,757 | ​ | ​ | 22.85 | ​ | ​ | ​ | ​
Settled (1) (2) |  | (912,703) | ​ | ​ | 26.37 | ​ | ​ | ​ | ​
Phantom units outstanding as of December 31, 2024 |  | — | ​ |  | ​ | ​ | ​ | ​ | ​
(1) | During the years ended December 31, 2024 and 2023, we purchased 54,152 and 27,576 ARLP common units, respectively, on the open market to settle the accounts of participants under the SERP. Units purchased were net of units settled in cash to satisfy tax withholding obligations.
(2) | On December 16, 2024, the SERP and Directors’ Deferred Compensation Plan were terminated, and final distributions of applicable plan accounts were settled in cash.

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