Share-Based Compensation (Schedule Of Share-Based Compensation Information) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share Based Compensation [Abstract]
Expense relating to share grants	$ 936,000	$ 859,000	$ 2,880,000	$ 2,312,000
Amounts capitalized	(76,000)	(54,000)	(187,000)	(167,000)
Total charged to operations	$ 860,000	$ 805,000	$ 2,693,000	$ 2,145,000