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COMMON UNIT-BASED COMPENSATION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2023
ARLP LTIP |
COMMON UNIT-BASED COMPENSATION PLANS |
Summary of activity in share-based plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of units |  | Weighted average grant date fair value per unit |  | Intrinsic value |
​ | ​ | ​ | ​ | ​ | ​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-vested grants at January 1, 2021 | ​ | 1,430,489 | ​ | $ | 5.02 | ​ | $ | 6,409 | ​
Granted (1) | ​ | 1,818,190 | ​ | ​ | 6.03 | ​ | ​ | ​ | ​
Forfeited | ​ | (118,204) | ​ |  | 5.48 | ​ | ​ | ​ | ​
Non-vested grants at December 31, 2021 | ​ | 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 | ​
(1) | Restricted units granted have certain minimum-value guarantees per unit, regardless of whether or not the awards vest.
(2) | During the year ended December 31, 2023, we issued 860,060 unrestricted common units to the LTIP participants. The remaining vested units were settled in cash to satisfy our 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 grant date fair value per unit |  | Intrinsic value |
​ | ​ | ​ | ​ | ​ | ​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Phantom units outstanding as of January 1, 2021 | ​ | 760,630 | ​ | $ | 22.04 | ​ | $ | 3,408 | ​
Granted | ​ | 46,638 | ​ | ​ | 9.45 | ​ | ​ | ​ | ​
Settled (1) | ​ | (138,570) | ​ | ​ | 25.86 | ​ | ​ | ​ | ​
Phantom units outstanding as of December 31, 2021 | ​ | 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 | ​
(1) | During the years ended December 31, 2023 and 2021, we purchased 27,576 ARLP common units and 102,962 ARLP common units 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.

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