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Stock-Based Compensation Plans and Employee Benefits (Tables) | 3 Months Ended
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Mar. 31, 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 three months ended March 31, 2019 and the year ended December 31, 2018.
| Three Months Ended March 31, 2019 |  | Year Ended December 31, 2018
| iPIP Investment Pool |  | iPIP Investment Pool
| 2013-2014 |  | 2015-2016 |  | 2017-2018 |  | 2013-2014 |  | 2015-2016 |  | 2017-2018
Points at beginning of period | 85.77 |  |  | 79.41 |  |  | 82.43 |  |  | 86.57 |  |  | 84.16 |  |  | 40.97 |
Granted | — |  |  | — |  |  | — |  |  | 0.50 |  |  | — |  |  | 49.33 |
Forfeited | — |  |  | (0.82 | ) |  | (1.03 | ) |  | (1.3 | ) |  | (4.75 | ) |  | (7.87 | )
Points at end of period | 85.77 |  |  | 78.59 |  |  | 81.40 |  |  | 85.77 |  |  | 79.41 |  |  | 82.43 |
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, 2019 and the year ended December 31, 2018, are as follows (in thousands):
| Three Months Ended March 31, 2019 |  | Year Ended December 31, 2018
Nonvested at beginning of period | 357 |  |  | 282 |
Granted | 474 |  |  | 278 |
Vested | (52 | ) |  | (142 | )
Forfeited | (9 | ) |  | (61 | )
Nonvested at end of period | 770 |  |  | 357 |

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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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