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Stock-Based Compensation Plans and Employee Benefits (Tables)
 9 Months Ended
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