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Revenues (Contract Balances) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2018
Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Balance as of January 1, 2018 $ 460,000    
Tenant openings (79,000)    
Executed leases 99,000    
Balance as of March 31, 2018 480,000    
Contract with Customer, Liability [Abstract]      
Contract with customer, liability, increase (decrease) 0    
Contract assets $ 460,000 $ 480,000  
Contract with customer, asset, settled in 2018   (271,000)  
Contract with customer, asset, settled in 2019   (205,000)  
Contract with customer, asset, settled in 2023   (4,000)  
Contract with customer, liability   $ (98,000) $ (98,000)
Revenue, performance obligation, lease commission recognized upon tenant opening, percentage 50.00%    
Equity Method Investments      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Balance as of January 1, 2018 $ 166,000    
Contract with Customer, Liability [Abstract]      
Contract assets $ 166,000