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COMMON UNIT-BASED COMPENSATION PLANS (Tables) | 3 Months Ended
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Mar. 31, 2023
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, 2023 | ​ | 3,697,133 | ​ | $ | 7.40 | ​ | ​ | 75,126 | ​
Granted (1) |  | 447,225 | ​ | ​ | 21.54 | ​ | ​ | ​ | ​
Vested (2) |  | (1,291,330) | ​ |  | 5.02 | ​ | ​ | ​ | ​
Forfeited |  | (118,144) | ​ |  | 6.48 | ​ | ​ | ​ | ​
Non-vested grants at March 31, 2023 |  | 2,734,884 | ​ |  | 10.88 | ​ | ​ | 55,163 | ​
(1) | The restricted units granted during 2023 have certain minimum-value guarantees per unit, regardless of whether or not the awards vest.
(2) | During the three months ended March 31, 2023, we issued 860,060 unrestricted common units to the LTIP participants. The remaining vested units were settled in cash to satisfy tax withholding obligations of the LTIP participants.
​
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, 2023 | ​ | 742,540 | ​ | $ | 20.28 | ​ | $ | 15,088 | ​
Granted | ​ | 23,980 | ​ | ​ | 21.30 | ​ | ​ | ​ | ​
Phantom units outstanding as of March 31, 2023 |  | 766,520 | ​ |  | 20.31 | ​ | ​ | 15,461 | ​
​

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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