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COMMON UNIT-BASED COMPENSATION PLANS (Tables) | 6 Months Ended
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Jun. 30, 2021
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 | ​ | 12,942 | ​ | ​ | 5.99 | ​ | ​ | ​ | ​
Phantom units outstanding as of June 30, 2021 |  | 773,572 | ​ |  | 21.77 | ​ | ​ | 5,577 | ​
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, 2021 | ​ | 1,430,489 | ​ | $ | 5.02 | ​ | $ | 6,409 | ​
Granted (1) |  | 1,818,190 | ​ | ​ | 6.03 | ​ | ​ | ​ | ​
Forfeited |  | (8,152) | ​ |  | 5.02 | ​ | ​ | ​ | ​
Non-vested grants at June 30, 2021 |  | 3,240,527 | ​ |  | 5.59 | ​ | ​ | 23,364 | ​
(1) | 921,430 units and 896,760 units have a minimum-value guarantee of $2.53 and $3.79 per unit, respectively, regardless of whether or not the awards vest.

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