Investment In Real Estate Joint Ventures And Partnerships (Schedule Of Combined Condensed Statements Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of Equity Method Investments [Line Items]
Revenues, net	$ 122,665		$ 98,135		$ 244,036	$ 209,487
Expenses
Depreciation and amortization	40,022		37,627		78,578	74,283
Interest, net	17,303		15,776		33,922	30,378
Operating	22,767		19,978		46,054	43,138
Real estate taxes, net	16,285		15,733		33,020	30,741
General and administrative	11,691		12,920		22,295	15,227
Provision for income taxes	86		343		324	515
Gain on dispositions	480		7,898		9,611	21,474
Net Income	14,441	$ 29,879	12,377	$ 54,248	44,320	66,625
Unconsolidated joint venture
Schedule of Equity Method Investments [Line Items]
Revenues, net	29,613		26,817		59,558	60,556
Expenses
Depreciation and amortization	8,416		8,902		16,854	17,664
Interest, net	1,132		2,334		2,756	4,752
Operating	5,438		5,462		11,261	12,573
Real estate taxes, net	3,592		4,215		7,127	8,615
General and administrative	198		233		303	338
Provision for income taxes	16		34		32	70
Total	18,792		21,180		38,333	44,012
Gain on dispositions	13		2,090		61	46,789
Net Income	$ 10,834		$ 7,727		$ 21,286	$ 63,333