Investment In Real Estate Joint Ventures And Partnerships (Schedule Of Combined Condensed Statements Of Operations) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]
Revenues, net	$ 36,061,000	$ 34,146,000	$ 70,799,000	$ 70,068,000
Expenses:
Depreciation and amortization	8,791,000	10,605,000	17,804,000	19,986,000
Interest, net	3,110,000	5,622,000	6,077,000	9,630,000
Operating	5,810,000	6,358,000	11,928,000	13,961,000
Real estate taxes, net	5,451,000	4,494,000	9,719,000	8,986,000
General and administrative	294,000	312,000	662,000	455,000
Provision (benefit) for income taxes	40,000	(31,000)	47,000	28,000
Impairment loss	0	0	0	1,303,000
Total	23,496,000	27,360,000	46,237,000	54,349,000
Gain on dispositions	32,224,000	1,033,000	47,987,000	46,190,000
Net income	16,461,000	19,377,000	28,458,000	28,683,000
Equity Method Investments [Member]
Expenses:
Gain on sale of non-operating property	0	0	0	373,000
Gain on dispositions	$ 3,896,000	$ 12,591,000	$ 3,896,000	$ 12,591,000