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Stock-Based Compensation Plans and Employee Benefits (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2020.
iPIP Investment Pool
2013-20142015-20162017-2018
Points at beginning of period81.17  73.28  77.27  
Forfeited(1.00) (1.13) (0.93) 
Points at end of period80.17  72.15  76.34  
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 six months ended June 30, 2020, is as follows (in thousands):
Nonvested at beginning of period598  
Granted181  
Vested (109) 
Nonvested at end of period670