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Stock-Based Compensation Plans and Employee Benefits (Tables)
12 Months Ended
Dec. 31, 2020
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, 2020.
iPIP Investment Pool
2013-20142015-20162017-2018
Points at beginning of period81.17 73.28 77.27 
Forfeited(1.00)(2.88)(3.93)
Points at end of period80.17 70.40 73.34 
Schedule of changes in non-vested restricted stock units Changes in non-vested restricted stock units ("Units") during the year ended December 31, 2020 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, 2019598 $9.18 $8,688 
Granted181 $14.68 
Vested(248)$9.62 
Non-vested as of December 31, 2020531 $10.85 $7,885