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Stock-Based Compensation Plans and Employee Benefits (Tables) | 3 Months Ended
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Mar. 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 three months ended March 31, 2021.
| iPIP Investment Pool |  |
| 2019-2020 |  | 2021-2022 |  |  |  |  |  |  |  |
Points at beginning of period | 97.40 |  |  | — |  |  |  |  |  |  |  |  |
Granted | — |  |  | 94.00 |  |  |  |  |  |  |  |  |
Forfeited | (0.20) |  |  | — |  |  |  |  |  |  |  |  |
Points at end of period | 97.20 |  |  | 94.00 |  |  |  |  |  |  |  |  |
The following is a summary of the status of the Company’s liability-classified iPIP plans and changes during the three months ended March 31, 2021.
| iPIP Investment Pool |  |
| 2013-2014 |  | 2015-2016 |  | 2017-2018 |  |  |  |  |  |  |  |
Points at beginning of period | 80.17 |  |  | 70.40 |  |  | 73.34 |  |  |  |  |  |  |  |  |
Forfeited | — |  |  | — |  |  | — |  |  |  |  |  |  |  |  |
Points at end of period | 80.17 |  |  | 70.40 |  |  | 73.34 |  |  |  |  |  |  |  |  |
Schedule of restricted stock units activity | A summary of the Company’s stock-based compensation awards to certain employees in the form of long-term incentive awards for the three months ended March 31, 2021, is as follows (in thousands):
Nonvested at beginning of period | 531 |  |  |
Granted | 327 |  |  |
Vested | (107) |  |  |
Nonvested at end of period | 751 |  |  |

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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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