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Stock-based Compensation (Tables) | 9 Months Ended
--- | ---
Sep. 30, 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 |  | (250,056) | ​ |  | 21.26 |  | (41,570) | ​ |  | 19.08
Forfeited |  | (5,597) | ​ |  | 21.36 |  | — | ​ |  | —
Non-vested at September 30, 2021 |  | 320,230 | ​ | $ | 21.48 |  | 87,800 | ​ | $ | 20.29
Vested but unissued at September 30, 2021 |  | 224,709 | ​ | $ | 21.08 |  | 108,685 | ​ | $ | 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 |  | 10,232 | ​ |  | 19.85
Forfeited | ​ | (11) | ​ | ​ | 18.25
Distributions |  | (2,606) | ​ |  | 19.03
Outstanding at September 30, 2021 |  | 127,863 | ​ | $ | 22.60
Vested at September 30, 2021 |  | 127,763 | ​ | $ | 22.60

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