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Stock-Based Compensation Plans and Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 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 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, 2020, is as follows (in thousands):
Nonvested at beginning of period598 
Granted181 
Vested (109)
Nonvested at end of period670