Annual report pursuant to Section 13 and 15(d)

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

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Investments In And Advances To Unconsolidated Real Estate Joint Ventures (Condensed Statements Of Financial Condition For Equity Method Joint Ventures) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]        
Cash and cash equivalents $ 90,037 $ 20,723 $ 22,103  
Property and equipment, net 7,803 29,836    
Equity method investments 58,010 57,330 64,738  
Goodwill 8,277 37,248 37,248 $ 39,482
Real estate 55,800 65,818    
Other assets 24,718 16,051    
Total assets 447,656 361,507 309,952  
Liabilities for subsidy guarantees 5,455 6,336    
Total liabilities 138,403 175,262    
Total equity 309,253 182,236 $ 237,530 $ 238,806
Total liabilities and equity 447,656 361,507    
Altman Companies [Member]        
Schedule of Equity Method Investments [Line Items]        
Cash and cash equivalents 3,100 1,634    
Property and equipment, net 363 315    
Equity method investments 7,382 6,353    
Goodwill 16,683 16,683    
Due from related parties 2,306 2,954    
Other assets 3,443 209    
Total assets 33,277 28,148    
Liabilities for subsidy guarantees 6,408 2,719    
Total liabilities 6,408 2,719    
Total equity 26,869 25,429    
Total liabilities and equity 33,277 28,148    
Altis at Bonterra - Hialeah, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investments   618    
Restricted cash   559    
Total assets   1,414    
Liabilities for subsidy guarantees   751    
Total liabilities   751    
Total equity   663    
Total liabilities and equity   1,414    
Altis At Lakeline - Austin Investors LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Cash and cash equivalents   628    
Restricted cash   5    
Other assets   144    
Total assets   777    
Total equity   777    
Total liabilities and equity   777    
Chapel Trail [Member]        
Schedule of Equity Method Investments [Line Items]        
Cash and cash equivalents   1,725    
Equity method investments $ 153 1,126    
Real estate   2,134    
Other assets   6    
Total assets   3,865    
Notes payable   184    
Liabilities for subsidy guarantees   357    
Total liabilities   541    
Total equity   3,324    
Total liabilities and equity   3,865    
PGA Design Center Holdings, LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity method investments   $ 996