Investment In Real Estate Joint Ventures And Partnerships (Schedule Of Combined Condensed Statements Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]
Revenues, net	$ 33,626	$ 33,383	$ 100,322	$ 104,182
Expenses:
Depreciation and amortization	7,925	8,595	24,164	26,399
Interest, net	2,974	2,851	9,478	8,928
Operating	6,001	5,727	18,074	17,655
Real estate taxes, net	4,728	4,775	14,861	14,494
General and administrative	253	(139)	573	523
Provision for income taxes	33	30	106	77
Total	21,914	21,839	67,256	68,076
Gain on dispositions	17,079	38,579	173,077	86,566
Net income	15,764	11,611	42,557	40,069
Equity Method Investments [Member]
Expenses:
Gain on dispositions	$ 4,052	$ 67	$ 9,491	$ 3,963