Annual report pursuant to Section 13 and 15(d)

Investments In And Advances To Unconsolidated Real Estate Joint Ventures (Condensed Statements Of Operations For Equity Method Joint Ventures) (Details)

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Investments In And Advances To Unconsolidated Real Estate Joint Ventures (Condensed Statements Of Operations For Equity Method Joint Ventures) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Total revenues $ 173,229 $ 203,724 $ 208,565
Operating losses (54,984) (9,503) (17,561)
Net earnings (loss) (47,090) 13,513 (9,467)
Equity in net earnings of unconsolidated real estate joint venture 465 37,898 14,194
The Addison on Millenia Investment, LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity in net earnings of unconsolidated real estate joint venture     9,300
Altman Companies [Member]      
Schedule of Equity Method Investments [Line Items]      
Total revenues 8,700 7,242 362
Other expenses (10,670) (9,493) (652)
Operating losses (1,970) (2,251) (290)
Net earnings (loss) (233) (3,164) (177)
Equity in net earnings of unconsolidated real estate joint venture (117) (1,582) (88)
Altis at Bonterra - Hialeah, LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Total revenues   4,498 6,510
Gain on sale of real estate   33,843  
Other expenses   (4,480) (5,937)
Net earnings (loss)   33,861 573
Equity in net earnings of unconsolidated real estate joint venture 29,200 29,221 544
Altman Glenewinkel Construction, LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity in net earnings of unconsolidated real estate joint venture 1,737 (913) 113
Altis At Lakeline - Austin Investors LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Total revenues   1,458 5,842
Gain on sale of real estate   17,178  
Other expenses   (1,801) (6,746)
Net earnings (loss)   16,835 (904)
Equity in net earnings of unconsolidated real estate joint venture $ 5,000 5,029 (312)
Chapel Trail [Member]      
Schedule of Equity Method Investments [Line Items]      
Total revenues   44,988  
Cost of sales   (35,575)  
Other expenses   (2,341) (1,388)
Net earnings (loss)   7,072 (1,388)
Equity in net earnings of unconsolidated real estate joint venture   $ 3,306 (649)
Altis at Shingle Creek Manager, LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Total revenues     1,704
Gain on sale of real estate     22,027
Other expenses     (2,156)
Net earnings (loss)     21,575
Equity in net earnings of unconsolidated real estate joint venture     $ 3,401