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Share-Based Compensation (Schedule of Share-Based Compensation Information) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share Based Compensation [Abstract]        
Expense relating to share/unit grants $ 1,127,000 $ 1,080,000 $ 3,364,000 $ 3,134,000
Amounts capitalized (92,000) (116,000) (286,000) (333,000)
Total charged to operations $ 1,035,000 $ 964,000 $ 3,078,000 $ 2,801,000