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Investments in Unconsolidated Joint Ventures (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]    
Depreciable basis (in years) of Company's additional basis 40 years  
Equity of certain joint ventures less than zero  
Income Loss From Equity Method Investments Potion Due To Impairment $ (17,951)  
CityOn.Xi'an [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
CityOn.Zhengzhou [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 24.50% 49.00%
Country Club Plaza [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
Fair Oaks [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
International Plaza [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.10% 50.10%
The Mall at Millenia [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
Stamford Town Center [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
Starfield Hanam [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 17.15% 34.30%
Sunvalley [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
Outside Partner, Ownership Percentage 50.00%  
The Mall at University Town Center [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
Waterside Shops [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
Westfarms [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 79.00% 79.00%
Blackstone [Member] | Starfield Hanam [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Summarized Financial Information, Ownership Interest Purchased By Joint Venture Partner 14.70%  
The Gardens Mall [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Summarized Financial Information, Ownership Interest Acquired 48.50%  
Starfield Hanam [Member]    
Schedule of Equity Method Investments [Line Items]    
Promote Fee Income $ 4,800  
Stamford Town Center [Member]    
Schedule of Equity Method Investments [Line Items]    
Income Loss From Equity Method Investments Potion Due To Impairment 18,000  
CityOn.Zhengzhou [Member]    
Schedule of Equity Method Investments [Line Items]    
Notes Receivable, Related Parties $ 43,100 $ 43,600