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Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2022 and changes during the nine month period then ended follow:
 Common SharesWeighted
Average Grant
Date Fair Value
Non-vested at December 31, 2021247,447 $17.41 
Granted247,579 16.53 
Vested(213,572)17.29 
Forfeited(5,356)18.01 
Non-vested at September 30, 2022276,098 $16.70 
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 nine months ended September 30, 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 September 30, 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.