Investments In Joint Ventures (Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Total assets		$ 685,000		$ 695,200
Total third party debt		496,900		510,700
Total equity		153,400		158,400
Total revenues		131,700		127,400		$ 121,900
Gain On Sale Of Joint Venture Operating Property Net Of Tax		19,800	[1]	0		0
Net income		37,500		16,400		13,500	[2]
Equity in income of joint ventures	$ 7,800	$ 14,783	[3],[4]	$ 7,836	[3]	$ 6,822	[3],[4]

[1] In December 2019, one of the funds sold one operating property comprised of 270 apartment homes for approximately $38.5 million.

[2] Net income for the year ended December 31, 2017 includes approximately $1.3 million of property expense relating to Hurricanes Harvey and Irma in the third quarter of 2017.

[3] Equity in income excludes our ownership interest of fee income from various services provided by us to the Funds.

[4] Equity in income for the year ended December 31, 2019 includes our ownership interest of the gain on sale of the operating property of approximately $6.2 million. Equity in income for the year ended December 31, 2017 includes our ownership interest of the hurricane related insurance recoveries and expenses of approximately $0.4 million.