Investment In Real Estate Joint Ventures And Partnerships (Schedule Of Combined Condensed Statements Of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Revenues, net	$ 138,316	$ 148,875	$ 153,301
Expenses:
Depreciation and amortization	38,242	37,771	40,235
Interest, net	16,076	17,053	22,657
Operating	26,126	26,797	27,365
Real estate taxes, net	17,408	18,525	18,159
General and administrative	816	839	916
Provision for income taxes	113	197	417
Impairment loss	1,303	7,487	1,526
Total	100,084	108,669	111,275
Gain on dispositions	100,714	59,621	146,290
Net Income	53,421	45,377	54,975
Equity Method Investments [Member]
Expenses:
Gain on sale of non-operating property	373	0	0
Gain on dispositions	$ 14,816	$ 5,171	$ 12,949