Share-Based Compensation (Schedule Of Share-Based Compensation Information) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share Based Compensation [Abstract]
Expense relating to share grants	$ 965,000	$ 886,000	$ 1,944,000	$ 1,453,000
Amounts capitalized	(65,000)	(56,000)	(111,000)	(113,000)
Total charged to operations	$ 900,000	$ 830,000	$ 1,833,000	$ 1,340,000