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Stock-Based Compensation Plans and Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2018
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 iPIP points and changes during the year ended December 31, 2018.
 
Year Ended December 31, 2018
 
iPIP Investment Pool
 
2013-2014
 
2015-2016
 
2017-2018
Points at beginning of period
86.57

 
84.16

 
40.97

Granted
0.50

 
—

 
49.33

Forfeited
(1.30
)
 
(4.75
)
 
(7.87
)
Points at end of period
85.77

 
79.41

 
82.43
Schedule of changes in non-vested restricted stock units
Changes in non-vested restricted stock units ("Units") during the year ended December 31, 2018 were as follows (number of shares and $ in thousands, except per share amounts):
 
 
Number
of Shares
 
Weighted Average
Grant Date
Fair Value
Per Share
 
Aggregate
Intrinsic
Value
Non-vested as of December 31, 2017
 
282

 
$
10.98

 
$
3,183

Granted
 
278

 
$
10.16

 
 
Vested
 
(142
)
 
$
10.37

 
 
Forfeited
 
(61
)
 
$
10.36

 
 
Non-vested as of December 31, 2018
 
357

 
$
10.68

 
$
3,277