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Share-Based Compensation (Schedule of Share-Based Compensation Information) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share Based Compensation [Abstract]      
Expense relating to share/unit grants $ 3,229,000 $ 3,954,000 $ 4,496,000
Amounts capitalized (186,000) (231,000) (379,000)
Total charged to operations $ 3,043,000 $ 3,723,000 $ 4,117,000
Unvested shares/units, December 31, 2020 642,000    
Restricted share grants 149,000    
Vested during period (247,000)    
Forfeitures/cancellations (52,000)    
Unvested shares/units, December 31, 2021 492,000 642,000  
Unvested shares/unit, December 31, 2020, weighted average grant date fair value $ 25.86    
Restricted share grants, weighted average grant date fair value 11.98    
Vested during period, weighted average grant date fair value 24.10    
Forfeitures/cancellations, weighted average grant date fair value 17.07    
Unvested shares/unit, December 31, 2021, weighted average grant date fair value $ 23.47 $ 25.86