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Share-Based Compensation (Schedule of Share-Based Compensation Information) (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Share Based Compensation [Abstract]    
Expense relating to share/unit grants $ 584,000 $ 929,000
Amounts capitalized (42,000) (49,000)
Total charged to operations $ 542,000 $ 880,000
Unvested shares/units, December 31, 2021 492,000  
Restricted share grants 4,000  
Vested during period (33,000)  
Unvested shares/units, March 31, 2022 463,000  
Unvested shares/unit, December 31, 2021, weighted average grant date fair value $ 23.47  
Restricted share grants, weighted average grant date fair value 25.11  
Vested during period, weighted average grant date fair value 24.34  
Unvested shares/unit, March 31, 2022, weighted average grant date fair value $ 23.42