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v3.21.1

Stock-based Compensation (Tables) | 3 Months Ended
--- | ---
Mar. 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 |  | 62,790 | ​ |  | 18.46
Vested |  | (226,346) | ​ |  | 21.29 |  | (35,070) | ​ |  | 18.81
Forfeited |  | (1,840) | ​ |  | 20.38 |  | — | ​ |  | —
Non-vested at March 31, 2021 |  | 347,697 | ​ | $ | 21.45 |  | 94,300 | ​ | $ | 20.31
Vested but unissued at March 31, 2021 |  | 211,931 | ​ | $ | 21.22 |  | 102,185 | ​ | $ | 20.48
Phantom Share Units (PSUs) [Member] |
Notes Tables |
Summary of the Phantom Stock Plan | ​
​ | ​ | ​ | ​ | ​ | ​
Phantom Stock Plan |  | Shares |  | Fair Value
Outstanding at December 31, 2020 |  | 120,248 | ​ | $ | 16.64
Granted |  | 7,828 | ​ |  | 19.15
Distributions |  | (1,389) | ​ |  | 16.84
Outstanding at March 31, 2021 |  | 126,687 | ​ | $ | 21.23
Vested at March 31, 2021 |  | 126,566 | ​ | $ | 21.23

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