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Stock-Based Compensation Plans and Employee Benefits (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2018 and the year ended December 31, 2017.
 
Six Months Ended June 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

 
—

 
49.08

 
5.00

 
17.88

 
41.68

Forfeited
(0.15
)
 
(0.89
)
 
(4.56
)
 
(10.43
)
 
(7.82
)
 
(0.71
)
Points at end of period
86.92

 
83.27

 
85.49

 
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 six months ended June 30, 2018 and the year ended December 31, 2017, are as follows (in thousands):
 
Six Months Ended June 30, 2018
 
Year Ended
December 31, 2017
Nonvested at beginning of period
282

 
290

Granted
264

 
116

Vested
(40
)
 
(75
)
Forfeited
(49
)
 
(49
)
Nonvested at end of period
457

 
282