Share-Based Compensation (Schedule Of Share-Based Compensation Information) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share Based Compensation [Abstract]
Expense relating to share grants	$ 3,141,000	$ 3,261,000	$ 3,761,000
Amounts capitalized	(211,000)	(93,000)	(230,000)
Total charged to operations	$ 2,930,000	$ 3,168,000	$ 3,531,000
Unvested shares, December 31, 2015	3,429,000
Restricted share grants	491,000
Vested during period	(115,000)
Forfeitures/cancellations	(167,000)
Unvested shares, December 31, 2016	3,638,000	3,429,000
Unvested shares, December 31, 2015, weighted average grant date fair value	$ 5.03
Restricted share grants, weighted average grant date fair value	6.87
Vested during period, weighted average grant date fair value	5.43
Forfeitures/cancellations, weighted average grant date fair value	5.54
Unvested shares, December 31, 2016, weighted average grant date fair value	$ 5.24	$ 5.03
Expense reduction related to forfeiture of restricted shares	$ 267,000