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Share-Based Compensation (Schedule of Share-Based Compensation Information) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share Based Compensation [Abstract]        
Expense relating to share/unit grants $ 1,140,000 $ 973,000 $ 2,237,000 $ 2,054,000
Amounts capitalized (112,000) (110,000) (194,000) (217,000)
Total charged to operations $ 1,028,000 $ 863,000 $ 2,043,000 $ 1,837,000