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Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Schedule of non-vested restricted common shares
A summary of the status of the Trust’s non-vested restricted common shares as of March 31, 2022 and changes during the three month period then ended follow:
 Common SharesWeighted
Average Grant
Date Fair Value
Non-vested at December 31, 2021247,447 $17.41 
Granted210,380 16.37 
Vested(187,262)17.21 
Forfeited(3,868)17.98 
Non-vested at March 31, 2022266,697 $16.72 
Schedule of weighted average grant date fair value assumptions The Company utilized a Monte Carlo simulation to calculate the weighted average grant date fair value of $30.17 per unit for the March 2022 grant using the following assumptions:
 
Volatility33.9 %
Dividend assumptionreinvested
Expected term in years2.84 years
Risk-free rate1.44 %
Share price (per share)$16.37 
Summary of the activity in the restricted share units
The following is a summary of the activity in the Trust’s restricted share units during the three months ended March 31, 2022: 
Executive AwardsTrustee Awards
 Restricted Share
Units		Weighted
Average Grant
Date Fair Value		Restricted Share
Units		Weighted
Average Grant
Date Fair Value
Non-vested at December 31, 2021976,570 $22.59 63,008 $17.85 
Granted299,019 20.51 64,004 16.67 
Vested(228,649)(1)25.27 (41,220)18.20 
Non-vested at March 31, 20221,046,940 $21.41 85,792 $16.81 
(1)Restricted units vested by Company executives in 2022 resulted in the issuance of 361,679 common shares, less 160,573 common shares withheld to cover minimum withholding tax obligations, for multiple employees.