Annual report pursuant to Section 13 and 15(d)

Investments In And Advances To Unconsolidated Real Estate Joint Ventures (Investments In Unconsolidated Real Estate Joint Ventures) (Details)

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Investments In And Advances To Unconsolidated Real Estate Joint Ventures (Investments In Unconsolidated Real Estate Joint Ventures) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 58,010 $ 57,330 $ 64,738
Altis at Grand Central Capital, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 2,287 2,653  
Investments in unconsolidated real estate joint ventures, Percent   11.07%    
Altis Promenade Capital, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 1,964 2,126  
Investments in unconsolidated real estate joint ventures, Percent   6.61%    
Altis at Bonterra - Hialeah, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures     618  
Investments in unconsolidated real estate joint ventures, Percent   96.73%    
Altis Ludlam - Miami Investor, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 9,653 1,081  
Investments in unconsolidated real estate joint ventures, Percent   33.30%    
Altis Grand at The Preserve (Suncoast) [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 1,086 753  
Investments in unconsolidated real estate joint ventures, Percent   33.30%    
Altis Pembroke Gardens, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 310 1,277  
Investments in unconsolidated real estate joint ventures, Percent   0.41%    
Altis Boca Raton [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures     1,880  
Investments in unconsolidated real estate joint ventures, Percent   0.42%    
Altis Wiregrass, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 163 1,792  
Investments in unconsolidated real estate joint ventures, Percent   2.22%    
Altis Little Havana [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 844 811  
Investments in unconsolidated real estate joint ventures, Percent   3.43%    
Altis Lake Willis (Vineland Pointe) [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 5,446 4,712  
Investments in unconsolidated real estate joint ventures, Percent   50.00%    
Altis Miramar East/West [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 2,818 2,631  
Investments in unconsolidated real estate joint ventures, Percent   5.00%    
The Altman Companies, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 15,222 14,745  
Investments in unconsolidated real estate joint ventures, Percent   50.00%    
Investments in unconsolidated real estate joint ventures, transaction costs $ 2,300 $ 2,300    
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  
Investments in unconsolidated real estate joint ventures, Percent   50.00%    
Bayview [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 1,563 1,562  
Investments in unconsolidated real estate joint ventures, Percent   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  
Investments in unconsolidated real estate joint ventures, Percent   40.00%    
Marbella [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 6,971 5,999  
Investments in unconsolidated real estate joint ventures, Percent   70.00%    
Chapel Trail [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 153 1,126  
Investments in unconsolidated real estate joint ventures, Percent   46.75%    
L03/212 Partners, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 2,462 2,087  
Investments in unconsolidated real estate joint ventures, Percent   3.41%    
PGA Lender, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures     2,111  
Investments in unconsolidated real estate joint ventures, Percent   45.88%    
Sky Cove, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 3,287 4,178  
Investments in unconsolidated real estate joint ventures, Percent   26.25%    
Other [Member]        
Schedule of Equity Method Investments [Line Items]        
Investments in and advances to unconsolidated real estate joint ventures   $ 31 $ 442