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Real Estate Investments and Equity Method Investments - Equity Method Investments (Details)
2 Months Ended 12 Months Ended
Mar. 14, 2019
USD ($)
Mar. 13, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Feb. 25, 2016
story
Real Estate [Line Items]            
Income from equity method investment     $ 273,000 $ 372,000 $ 0  
22-story mixed use tower | Durham City Center II LLC            
Real Estate [Line Items]            
Interests in equity method investments           37.00%
Number stories in the mixed use tower | story           22
Payments to acquire equity method investments     $ 500,000 7,300,000 11,200,000  
Income from equity method investment         0  
Dividends from equity investment   $ 300,000   $ 400,000 $ 0  
Office And Retail Portions | Durham City Center II LLC            
Real Estate [Line Items]            
Interests in equity method investments 37.00%          
Durham City Center            
Real Estate [Line Items]            
Acquisition, cash consideration $ 23,200,000