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Stock-Based Compensation Plans and Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of performance incentive plans | The following is a summary of the status of the Company’s equity-classified iPIP plans and changes during the year ended December 31, 2021.
​ | ​ | ​ | ​ | ​
​ | ​ | iPIP Investment Pool
​ |  | 2019-2020 |  | 2021-2022
Points at beginning of period |  | 97.40 |  | —
Granted | ​ | — | ​ | 94.75
Forfeited |  | (2.20) |  | (10.00)
Points at end of period |  | 95.20 |  | 84.75
​ The following is a summary of the status of the Company’s liability-classified iPIP plans and changes during the year ended December 31, 2021. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | iPIP Investment Pool
​ |  | 2013‑2014 |  | 2015‑2016 |  | 2017‑2018
Points at beginning of period |  | 80.17 |  | 70.40 |  | 73.34
Granted | ​ | — | ​ | — | ​ | 2.00
Points at end of period |  | 80.17 |  | 70.40 |  | 75.34
Schedule of changes in non-vested restricted stock units | Changes in non-vested restricted stock units (“Units”) during the year ended December 31, 2021 were as follows (number of shares and $ in thousands, except per share amounts): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Grant Date | ​ | Aggregate
​ | ​ | Number | ​ | Fair Value | ​ | Intrinsic
​ | ​ | of Shares | ​ | Per Share | ​ | Value
Nonvested at beginning of period | ​ | 531 | ​ | $ | 10.85 | ​ | $ | 7,885
Granted | ​ | 372 | ​ | $ | 18.59 | ​ |  | ​
Vested | ​ | (115) | ​ | $ | 9.37 | ​ |  | ​
Forfeited | ​ | (34) | ​ | $ | 15.67 | ​ | ​ | ​
Nonvested at end of period |  | 754 | ​ | $ | 14.67 | ​ | $ | 19,480

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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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