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Equity Method Investment (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Feb. 25, 2016
story
Schedule of Equity Method Investments [Line Items]            
Equity method investments $ 11,169,000   $ 11,169,000   $ 10,235,000  
Construction loan outstanding 488,609,000   488,609,000   522,180,000  
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
Equity method investments 11,200,000   11,200,000   10,300,000  
Guarantee of construction loan           37.00%
Assets being used as collateral for the construction loan           100.00%
Construction loan outstanding 7,800,000   7,800,000      
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 $ 18,700,000   $ 18,700,000