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Real Estate Investments and Equity Method Investments - Equity Method Investments (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Feb. 25, 2016
story
Real Estate [Line Items]        
Equity method investments $ 22,203,000 $ 11,411,000    
Construction loan outstanding 694,239,000 517,272,000    
Income from equity method investment 372,000 0 $ 0  
Durham City Center II LLC        
Real Estate [Line Items]        
Construction loan outstanding 18,500,000 11,200,000    
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 7,300,000 11,200,000    
Equity method investments 22,200,000 11,400,000    
Investment in equity method investments 21,300,000 10,900,000    
Assets being used as collateral for the construction loan       100.00%
Income from equity method investment 400,000 0 0  
Dividends from equity investment   0 $ 0  
Durham City Center II LLC | Durham City Center II LLC        
Real Estate [Line Items]        
Construction loan outstanding $ 48,900,000 $ 29,200,000