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Stock-Based Compensation Plans and Employee Benefits (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [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 year ended December 31, 2019.
 
iPIP Investment Pool
 
2013-2014
 
2015-2016
 
2017-2018
Points at beginning of period
85.77

 
79.41

 
82.43

Granted
—

 
—

 
—

Forfeited
(4.60
)
 
(6.13
)
 
(5.16
)
Points at end of period
81.17

 
73.28

 
77.27
Schedule of changes in non-vested restricted stock units Changes in non-vested restricted stock units ("Units") during the year ended December 31, 2019 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, 2018
 
357

 
$
10.68

 
$
3,277

Granted
 
485

 
$
8.84

 
 
Vested
 
(153
)
 
$
11.12

 
 
Forfeited
 
(91
)
 
$
9.99

 
 
Non-vested as of December 31, 2019
 
598

 
$
9.18

 
$
8,688