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COMMON UNIT-BASED COMPENSATION PLANS | 3 Months Ended
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Mar. 31, 2021
COMMON UNIT-BASED COMPENSATION PLANS |
COMMON UNIT-BASED COMPENSATION PLANS | 14.COMMON UNIT-BASED COMPENSATION PLANS ​ Long-Term Incentive Plan ​ We maintain the LTIP for certain employees and officers of MGP and its affiliates who perform services for us. As part of our LTIP, unit awards of non-vested "phantom" or notional units, also referred to as "restricted units", may be granted which upon satisfaction of time and performance-based vesting requirements, entitle the LTIP participant to receive ARLP common units. Certain awards may also contain a minimum-value guarantee payable in ARLP common units or cash. Annual grant levels, vesting provisions and minimum-value guarantees of restricted units for designated participants are recommended by Mr. Craft, subject to review and approval of the compensation committee of the MGP board of directors (the "Compensation Committee"). Vesting of all restricted units outstanding is subject to the satisfaction of certain financial tests. If it is not probable the financial tests for a particular grant of restricted units will be met, any previously expensed amounts for that grant are reversed and no future expense will be recognized for that grant. Assuming the financial tests are met, grants of restricted units issued to LTIP participants are generally expected to cliff vest on January 1st of the third year following issuance of the grants. We expect to settle restricted unit grants by delivery of newly-issued ARLP common units, except for the portion of the grants that will satisfy employee tax withholding obligations of LTIP participants. We account for forfeitures of non-vested LTIP restricted unit grants as they occur. As provided under the distribution equivalent rights ("DERs") provisions of the LTIP and the terms of the LTIP restricted unit awards, all non-vested restricted units include contingent rights to receive quarterly distributions in cash or, at the discretion of the Compensation Committee, phantom units in lieu of cash credited to a bookkeeping account with value equal to the cash distributions we make to unitholders during the vesting period. If it is not probable the financial tests for a particular grant of restricted units will be met, any previously paid DER amounts for that grant are reversed from Partners’ Capital and recorded as compensation expense and any future DERs, for that grant, if any, will be recognized as compensation expense when paid. ​ A summary of non-vested LTIP grants as of and for the three months ended March 31, 2021 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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 | ​
Forfeited |  | (5,823) | ​ |  | 5.02 | ​ | ​ | ​ | ​
Non-vested grants at March 31, 2021 |  | 1,424,666 | ​ |  | 5.02 | ​ | ​ | 8,263 | ​
​ LTIP expense for grants of restricted units was $0.7 million and $(0.7) million for the three months ended March 31, 2021 and 2020, respectively. LTIP expense for grants of restricted units for the three months ended March 31, 2020 includes the reversal of $4.8 million of cumulative previously recognized expense for the 2019 Grants, which were determined to be not probable of vesting, offset in part by related DERs for the 2019 Grants previously recorded to equity and then expensed. ​ The total obligation associated with LTIP grants of restricted units as of March 31, 2021 was $2.1 million and is included in the partners' capital Limited partners-common unitholders line item in our condensed consolidated balance sheets. As of March 31, 2021, there was $5.1 million in total unrecognized compensation expense related to the non-vested LTIP restricted unit grants that are expected to vest. That expense is expected to be recognized over a weighted-average period of 1.8 years. ​ On April 22, 2021, the Compensation Committee also authorized additional grants of 1,833,190 restricted units, of which 1,818,190 units were granted. The new grants are subject to both a service and performance requirement and contain minimum-value guarantees. ​ Supplemental Executive Retirement Plan and Directors' Deferred Compensation Plan ​ We utilize the SERP to provide deferred compensation benefits for certain officers and key employees. All allocations made to participants under the SERP are made in the form of "phantom" ARLP units and SERP distributions will be settled in the form of ARLP common units. The SERP is administered by the Compensation Committee. ​ Our directors participate in the Directors' Deferred Compensation Plan. Pursuant to the Directors' Deferred Compensation Plan, for amounts deferred either automatically or at the election of the director, a notional account is established and credited with notional common units of ARLP, described in the Directors' Deferred Compensation Plan as "phantom" units. Distributions from the Directors' Deferred Compensation Plan will be settled in the form of ARLP common units. ​ For both the SERP and Directors' Deferred Compensation Plan, when quarterly cash distributions are made with respect to ARLP common units, an amount equal to such quarterly distribution is credited to each participant's notional account as additional phantom units. All grants of phantom units under the SERP and Directors' Deferred Compensation Plan vest immediately. ​ Total SERP and Directors' Deferred Compensation Plan expense was $0.04 million and $0.3 million for the three months ended March 31, 2021 and 2020, respectively. As of March 31, 2021, there were 760,630 total phantom units outstanding under the SERP and Directors' Deferred Compensation Plan with a weighted average grant date fair value of $22.04 per unit and a total intrinsic value of $4.4 million. As of March 31, 2021, the total obligation associated with the SERP and Directors' Deferred Compensation Plan was $16.8 million and is included in the partners' capital Limited partners-common unitholders line item in our condensed consolidated balance sheets.

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