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Investment in Unconsolidated Joint Ventures (Carolina Square Holdings LP) (Details)
ft² in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
ft²
extension
apartment_unit
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]    
Aggregate outstanding indebtedness $ 342,892 $ 338,590
Carolina Square Holdings LP    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage of partner in joint venture 50.00%  
Number of apartment units | apartment_unit 246  
Aggregate outstanding indebtedness $ 74,638 $ 64,412
Maximum percentage guaranteed under construction loan 12.50%  
Cash balance of joint venture $ 3,800  
Carolina Square Holdings LP | LIBOR    
Schedule of Equity Method Investments [Line Items]    
Basis spread on variable rate (percent) 1.90%  
Number of loan extensions | extension 2  
Extension period 1 year  
Carolina Square Holdings LP | Office Space    
Schedule of Equity Method Investments [Line Items]    
Square footage of real estate property (square feet) | ft² 158  
Carolina Square Holdings LP | Retail Space    
Schedule of Equity Method Investments [Line Items]    
Square footage of real estate property (square feet) | ft² 44  
Carolina Square Holdings LP | Northwood Ravin    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage of partner in joint venture 50.00%