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Equity Method Investment (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Feb. 25, 2016
story
Schedule of Equity Method Investments [Line Items]            
Investment in equity method investment during period     $ 5,400,000 $ 934,000    
Equity method investments $ 16,811,000   16,811,000   $ 11,411,000  
Construction loan outstanding 653,750,000   653,750,000   517,272,000  
22-Story Mixed Use Tower | City Center            
Schedule of Equity Method Investments [Line Items]            
Interests in equity method investments           37.00%
Number stories in the mixed use tower (story) | story           22
Investment in equity method investment during period     5,100,000      
Investment in equity method investments 15,900,000   15,900,000   10,900,000  
Equity method investments 16,800,000   16,800,000   11,400,000  
Guarantee of construction loan           37.00%
Assets being used as collateral for the construction loan           100.00%
Construction loan outstanding 16,300,000   16,300,000   11,200,000  
Dividends from equity investment 0 $ 0 0 0    
Income from equity method investment 0 $ 0 0 $ 0    
City Center | 22-Story Mixed Use Tower | City Center            
Schedule of Equity Method Investments [Line Items]            
Construction loan outstanding $ 44,200,000   $ 44,200,000   $ 29,200,000