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Stock-Based Compensation Plans and Employee Benefits (Tables) | 9 Months Ended
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Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of performance incentive plans | 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, 2019.
| iPIP Investment Pool
| 2013-2014 |  | 2015-2016 |  | 2017-2018
Points at beginning of period | 85.77 |  |  | 79.41 |  |  | 82.43 |
Granted | — |  |  | — |  |  | — |
Forfeited | (1.60 | ) |  | (2.73 | ) |  | (3.72 | )
Points at end of period | 84.17 |  |  | 76.68 |  |  | 78.71 |
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 nine months ended September 30, 2019, is as follows (in thousands):
Nonvested at beginning of period | 357 |
Granted | 481 |
Vested | (52 | )
Forfeited | (89 | )
Nonvested at end of period | 697 |

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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=109197908&loc=d3e5070-113901 + Details
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