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Investments In And Advances To Unconsolidated Real Estate Joint Ventures (Narrative) (Details) $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) ft² property item	Apr. 30, 2020 USD ($)	Mar. 31, 2020 property	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated real estate joint ventures	$ 63,775			$ 63,775	$ 65,254	$ 63,775	$ 65,254	$ 57,330
Equity in earning of unconsolidated real estate joint ventures				$ 145	8,759	$ 696	8,742
The Altman Companies, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Consolidated method ownership percentage	50.00%			50.00%		50.00%
PGA Design Center Holdings, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated real estate joint ventures	$ 996			$ 996		$ 996		996
Equity in earning of unconsolidated real estate joint ventures				12	2,849	24	2,812
Altis Ludlam - Miami Investor, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated real estate joint ventures	9,051			9,051		9,051		1,081
The Altman Companies, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated real estate joint ventures	16,001			16,001		16,001		14,745
ABBX Guaranty, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated real estate joint ventures	3,750			3,750		3,750		3,750
Altis at Bonterra - Hialeah, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated real estate joint ventures	598			598		598		618
Altis At Lakeline - Austin Investors LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity in earning of unconsolidated real estate joint ventures					$ 5,256		$ 5,029
L03/212 Partners, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated real estate joint ventures	1,934			1,934		1,934		2,087
PGA Lender, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated real estate joint ventures	2,111			2,111		2,111		2,111
Sky Cove, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated real estate joint ventures	4,053			4,053		4,053		4,178
Altis LH-Miami Manager, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated real estate joint ventures	829			829		829		811
Altis Vineland Pointe [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated real estate joint ventures	5,122			5,122		5,122		4,712
Altis Wiregrass, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated real estate joint ventures	266			266		266		1,792
Number of multi-family apartment developments \| property			392
Distribution from investee		$ 2,300
Equity in earning of unconsolidated real estate joint ventures						800
BBXRE [Member] \| Altis Ludlam - Miami Investor, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated real estate joint ventures	$ 8,500			$ 8,500		$ 8,500		$ 1,100
Area of retail space \| ft²	7,500
Number of multi-family apartment developments \| property	312
Distribution from investee	$ 500
Equity in earning of unconsolidated real estate joint ventures	$ 11,900
Number of extensions \| item	3
Period of each extension	1 year