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Stock-based Compensation (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Notes Tables |
Summary of the Company's RSU and PRSU awards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | RSU Awards | ​ | PRSU Awards
​ | ​ | ​ | ​ | Weighted-Average | ​ | ​ | ​ | Weighted-Average
​ | ​ | ​ | ​ | Grant-Date | ​ | ​ | ​ | Grant-Date
​ |  | Shares |  | Fair Value |  | Shares |  | Fair Value
Non-vested at December 31, 2020 |  | 336,898 | ​ | $ | 23.48 |  | 66,580 | ​ | $ | 21.26
Granted |  | 238,985 | ​ |  | 18.44 |  | 94,185 | ​ |  | 18.46
Vested |  | (259,856) | ​ |  | 21.26 |  | (57,845) | ​ |  | 18.91
Forfeited |  | (5,597) | ​ |  | 21.36 |  | — | ​ |  | —
Non-vested at December 31, 2021 |  | 310,430 | ​ | $ | 21.49 |  | 102,920 | ​ | $ | 20.02
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Vested but unissued at December 31, 2021 |  | 232,709 | ​ | $ | 21.13 |  | 124,960 | ​ | $ | 20.22
Summary of the Phantom Stock Plan | ​
​ | ​ | ​ | ​ | ​ | ​
Phantom Stock Plan |  | Shares |  | Fair Value
Outstanding at December 31, 2020 |  | 120,248 | ​ | $ | 16.64
Granted |  | 11,336 | ​ |  | 20.28
Forfeited | ​ | (11) | ​ | ​ | 18.25
Distributions |  | (2,692) | ​ |  | 19.17
Outstanding at December 31, 2021 |  | 128,881 | ​ | $ | 24.30
Vested at December 31, 2021 |  | 128,818 | ​ | $ | 24.30

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