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Stock-Based Compensation Plans and Employee Benefits (Tables) | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of iPip activity | The following is a summary of the status of the Company’s iPIP points and changes during the nine months ended September 30, 2018 and the year ended December 31, 2017.
| Nine Months Ended September 30, 2018 |  | Year Ended December 31, 2017
| iPIP Investment Pool |  | iPIP Investment Pool
| 2013-2014 |  | 2015-2016 |  | 2017-2018 |  | 2013-2014 |  | 2015-2016 |  | 2017-2018
Points at beginning of period | 86.57 |  |  | 84.16 |  |  | 40.97 |  |  | 92.00 |  |  | 74.10 |  |  | 0 |
Granted | 0.50 |  |  | — |  |  | 49.33 |  |  | 5.00 |  |  | 17.88 |  |  | 41.68 |
Forfeited | (1.31 | ) |  | (4.80 | ) |  | (7.88 | ) |  | (10.43 | ) |  | (7.82 | ) |  | (0.71 | )
Points at end of period | 85.76 |  |  | 79.36 |  |  | 82.42 |  |  | 86.57 |  |  | 84.16 |  |  | 40.97 |
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, 2018 and the year ended December 31, 2017, are as follows (in thousands):
| Nine Months Ended September 30, 2018 |  | Year Ended December 31, 2017
Nonvested at beginning of period | 282 |  |  | 290 |
Granted | 278 |  |  | 116 |
Vested | (45 | ) |  | (75 | )
Forfeited | (61 | ) |  | (49 | )
Nonvested at end of period | 454 |  |  | 282 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in other outstanding share-based compensation awards other than stock options or nonvested awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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