Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Narrative) (Details)

v3.20.2
Subsequent Events (Narrative) (Details)
shares in Millions, $ in Millions
Oct. 22, 2020
CAD ($)
Oct. 22, 2020
USD ($)
Oct. 20, 2020
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]            
Investments in and advances to unconsolidated real estate joint ventures       $ 60,648,000 $ 57,330,000 $ 53,739,000
The Altman Companies, LLC [Member]            
Debt Instrument [Line Items]            
Investments in and advances to unconsolidated real estate joint ventures       $ 15,589,000 $ 14,745,000  
Class A and Class B Common Stock [Member] | Subsequent Event [Member]            
Debt Instrument [Line Items]            
Authorized share repurchase program | shares     10      
Colonial Elegance [Member] | Subsequent Event [Member] | Renin [Member]            
Debt Instrument [Line Items]            
Purchase consideration $ 51.0 $ 39,000,000        
Business combination, estimated excess target working capital 13.0 9,900,000        
Business combination, target working capital 6.7 5,100,000        
Business combination, target working capital held $ 1.3 1,000,000        
Capital contributions   $ 5,000,000        
Colonial Elegance [Member] | Subsequent Event [Member] | TD Bank Credit Facility [Member] | Renin [Member]            
Debt Instrument [Line Items]            
Quarterly payments of principal percentage 37.50% 37.50%        
Colonial Elegance [Member] | Subsequent Event [Member] | Term Loans [Member] | TD Bank Credit Facility [Member] | Renin [Member]            
Debt Instrument [Line Items]            
Debt face amount   $ 30,000,000        
Proceeds from loans   30,000,000        
Colonial Elegance [Member] | Subsequent Event [Member] | Operating Loans [Member] | TD Bank Credit Facility [Member] | Renin [Member]            
Debt Instrument [Line Items]            
Debt face amount   20,000,000        
Proceeds from loans   $ 8,000,000        
Prime Rate [Member] | Colonial Elegance [Member] | Subsequent Event [Member] | TD Bank Credit Facility [Member] | Minimum [Member] | Renin [Member]            
Debt Instrument [Line Items]            
Basis spread on rate 1.375% 1.375%        
Prime Rate [Member] | Colonial Elegance [Member] | Subsequent Event [Member] | TD Bank Credit Facility [Member] | Maximum [Member] | Renin [Member]            
Debt Instrument [Line Items]            
Basis spread on rate 1.875% 1.875%        
Base Rate [Member] | Colonial Elegance [Member] | Subsequent Event [Member] | TD Bank Credit Facility [Member] | Minimum [Member] | Renin [Member]            
Debt Instrument [Line Items]            
Basis spread on rate 1.00% 1.00%        
Base Rate [Member] | Colonial Elegance [Member] | Subsequent Event [Member] | TD Bank Credit Facility [Member] | Maximum [Member] | Renin [Member]            
Debt Instrument [Line Items]            
Basis spread on rate 1.50% 1.50%        
Acceptance Rate [Member] | Colonial Elegance [Member] | Subsequent Event [Member] | TD Bank Credit Facility [Member] | Minimum [Member] | Renin [Member]            
Debt Instrument [Line Items]            
Basis spread on rate 2.875% 2.875%        
Acceptance Rate [Member] | Colonial Elegance [Member] | Subsequent Event [Member] | TD Bank Credit Facility [Member] | Maximum [Member] | Renin [Member]            
Debt Instrument [Line Items]            
Basis spread on rate 3.375% 3.375%