Investments In Unconsolidated Real Estate Joint Ventures (Condensed Statements Of Operations For Equity Method Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity in net earnings of unconsolidated real estate joint venture	$ 622	$ 28,534	$ 8,759	$ (17)	$ 13,029	$ 373	$ (488)	$ 1,280	$ 37,898	$ 14,194	$ 12,541
Altis at Bonterra - Hialeah, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Total revenues									4,498	6,510	1,851
Gain on sale of real estate									33,843
Other expenses									(4,480)	(5,937)	(2,657)
Net earnings (losses)									33,861	573	(806)
Equity in net earnings of unconsolidated real estate joint venture									29,221	544	(766)
The Addison on Millenia Investment, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Total revenues										26,061	1,303
Gain on sale of real estate										22,203
Other revenue										3,858	1,303
Total expenses										(2,266)	(1,794)
Net earnings (losses)										23,795	(491)
Equity in net earnings of unconsolidated real estate joint venture										9,283	(146)
Altis At Lakeline - Austin Investors LLC [Member]
Schedule of Equity Method Investments [Line Items]
Total revenues									1,458	5,842	3,528
Gain on sale of real estate									17,178
Other expenses									(1,801)	(6,746)	(6,028)
Net earnings (losses)									16,835	(904)	(2,500)
Equity in net earnings of unconsolidated real estate joint venture									$ 5,029	$ (312)	$ (862)