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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Stock-Based Compensation |
Schedule of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | Number | ​ | ​ | Average Grant
​ |  | ​ | of Shares |  | ​ | Date Fair Value
Unvested as of December 31, 2018 | ​ | ​ | — | ​ | $ | —
Granted | ​ | ​ | 162,550 | ​ | ​ | 27.06
Vested | ​ | ​ | (11,239) | ​ | ​ | 27.37
Forfeited | ​ | ​ | (11,593) | ​ | ​ | 27.04
Unvested as of December 31, 2019 | ​ | ​ | 139,718 | ​ | $ | 27.04
Granted | ​ | ​ | 172,046 | ​ | ​ | 25.96
Vested | ​ | ​ | (48,340) | ​ | ​ | 27.03
Forfeited | ​ | ​ | (1,047) | ​ | ​ | 25.96
Unvested as of December 31, 2020 | ​ | ​ | 262,377 | ​ | $ | 26.35
Granted | ​ | ​ | — | ​ | ​ | —
Vested | ​ | ​ | (105,330) | ​ | ​ | 26.46
Forfeited | ​ | ​ | (7,172) | ​ | ​ | 26.15
Unvested as of December 31, 2021 | ​ | ​ | 149,875 | ​ | $ | 26.28
Schedule of PSU activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | Number | ​ | ​ | Average Grant
​ |  | ​ | of Shares |  | ​ | Date Fair Value
Unvested as of December 31, 2018 | ​ | ​ | 504,497 | ​ | $ | 25.93
Granted | ​ | ​ | 310,696 | ​ | ​ | 27.04
Vested | ​ | ​ | (36,342) | ​ | ​ | 24.51
Forfeited | ​ | ​ | (83,535) | ​ | ​ | 26.37
Unvested as of December 31, 2019 | ​ | ​ | 695,316 | ​ | $ | 26.46
Granted | ​ | ​ | 340,758 | ​ | ​ | 25.96
Vested | ​ | ​ | (172,167) | ​ | ​ | 29.95
Forfeited | ​ | ​ | (6,625) | ​ | ​ | 26.13
Unvested as of December 31, 2020 | ​ | ​ | 857,282 | ​ | $ | 25.43
Granted | ​ | ​ | 376,810 | ​ | ​ | 27.07
Vested | ​ | ​ | (214,163) | ​ | ​ | 22.57
Forfeited | ​ | ​ | (77,423) | ​ | ​ | 24.62
Unvested as of December 31, 2021 | ​ | ​ | 942,506 | ​ | $ | 26.70
Schedule of RSU activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | Number | ​ | ​ | Average Grant
​ |  | ​ | of Shares |  | ​ | Date Fair Value
Unvested as of December 31, 2018 | ​ | ​ | 48,761 | ​ | $ | 28.60
Granted | ​ | ​ | 20,418 | ​ | ​ | 26.50
Vested | ​ | ​ | (22,452) | ​ | ​ | 28.37
Forfeited | ​ | ​ | (1,944) | ​ | ​ | 28.29
Unvested as of December 31, 2019 | ​ | ​ | 44,783 | ​ | $ | 27.82
Granted | ​ | ​ | 28,783 | ​ | ​ | 15.86
Vested | ​ | ​ | (30,016) | ​ | ​ | 27.47
Forfeited | ​ | ​ | — | ​ | ​ | —
Unvested as of December 31, 2020 | ​ | ​ | 43,550 | ​ | $ | 21.93
Granted | ​ | ​ | 198,771 | ​ | ​ | 27.13
Vested | ​ | ​ | (49,519) | ​ | ​ | 23.08
Forfeited | ​ | ​ | (7,473) | ​ | ​ | 26.37
Unvested as of December 31, 2021 | ​ | ​ | 185,329 | ​ | $ | 27.09

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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