Share-Based Compensation (Schedule of Share-Based Compensation Information) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share Based Compensation [Abstract]
Expense relating to share/unit grants	$ 822,000	$ 1,127,000	$ 2,930,000	$ 3,364,000
Amounts capitalized	(55,000)	(92,000)	(177,000)	(286,000)
Total charged to operations	$ 767,000	$ 1,035,000	$ 2,753,000	$ 3,078,000