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Stock-Based Compensation Plans and Employee Benefits (Tables) | 9 Months Ended
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Sep. 30, 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 nine months ended September 30, 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 nine months ended September 30, 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 restricted stock units activity |
​ | ​ | ​
Nonvested at beginning of period | ​ | 531
Granted | ​ | 372
Vested | ​ | (112)
Forfeited | ​ | (32)
Nonvested at end of period |  | 759

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- Definition Schedule Of Share-Based Compensation, Performance Incentive Plans, Activity [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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