Investment In Real Estate Joint Ventures And Partnerships (Schedule Of Combined Condensed Statements Of Operations) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]
Revenues, net	$ 33,383,000	$ 33,875,000	$ 104,182,000	$ 103,943,000
Expenses:
Depreciation and amortization	8,595,000	9,079,000	26,399,000	29,065,000
Interest, net	2,851,000	3,300,000	8,928,000	12,930,000
Operating	5,727,000	5,922,000	17,655,000	19,883,000
Real estate taxes, net	4,775,000	4,223,000	14,494,000	13,209,000
General and administrative	(139,000)	233,000	523,000	688,000
Provision for income taxes	30,000	42,000	77,000	70,000
Impairment loss	0	0	0	1,303,000
Total	21,839,000	22,799,000	68,076,000	77,148,000
Gain on dispositions	38,579,000	22,108,000	86,566,000	68,298,000
Net income	11,611,000	11,147,000	40,069,000	39,830,000
Equity Method Investments [Member]
Expenses:
Gain on sale of non-operating property	0	0	0	373,000
Gain on dispositions	$ 67,000	$ 71,000	$ 3,963,000	$ 12,662,000