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