Investment In Real Estate Joint Ventures And Partnerships (Schedule Of Combined Condensed Statements Of Operations) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Revenues, net	$ 433,917	$ 486,625	$ 531,147
Expenses
Depreciation and amortization	149,930	135,674	161,838
Interest, net	61,148	57,601	63,348
Operating	91,075	94,620	90,554
Real estate taxes, net	62,564	60,813	69,268
General and administrative	37,388	35,914	25,040
Provision for income taxes	451	1,040	1,378
Gain on dispositions	65,402	189,914	207,865
Net Income	118,959	322,575	345,343
Unconsolidated joint venture
Schedule of Equity Method Investments [Line Items]
Revenues, net	124,409	135,258	133,975
Expenses
Depreciation and amortization	35,971	32,126	32,005
Interest, net	9,175	9,664	11,905
Operating	24,775	25,046	24,112
Real estate taxes, net	16,733	18,070	18,839
General and administrative	601	551	696
Provision for income taxes	121	133	138
Total	87,376	85,590	87,695
Gain on dispositions	47,002	2,009	9,495
Net Income	$ 84,035	$ 51,677	$ 55,775