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Investments in Unconsolidated Joint Ventures (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Depreciable Basis In Years 40 years  
Equity of certain joint ventures less than zero  
CityOn.Xi'an [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 25.00% 50.00%
CityOn.Zhengzhou [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 24.50% 24.50%
Country Club Plaza [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
Fair Oaks Mall [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
The Gardens Mall [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 48.50% 48.50%
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% 17.15%
Sunvalley [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 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%
Stamford Town Center [Member]    
Schedule of Equity Method Investments [Line Items]    
Income Loss From Equity Method Investments Potion Due To Impairment   $ 18,000
Blackstone Transaction [Member] | CityOn.Xi'an [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 25.00%  
Equity Method Investment, Summarized Financial Information, Ownership Interest Sold 50.00%  
Blackstone Transaction [Member] | CityOn.Zhengzhou [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Summarized Financial Information, Ownership Interest Sold 50.00%  
CityOn.Zhengzhou [Member]    
Schedule of Equity Method Investments [Line Items]    
Notes Receivable, Related Parties $ 42,400 $ 43,100