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Revenues - Contract Balances (Details) - USD ($)
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Contract Assets Activity [Roll Forward]        
Balance at beginning of period $ 460,000      
Tenant openings (375,000)      
Executed leases 525,000      
Balance at end of period 610,000      
Investments in unconsolidated affiliates       $ 166,000
Increase (decrease) in contract with customer liability 0      
Contract with Customer, Liability [Abstract]        
Contract with customer - asset $ 460,000 $ 610,000   $ 460,000
Contract with customer - asset - remainder of 2018   (213,000)    
Contract with customer - asset - 2019   (389,000)    
Contract with customer - asset - 2020   (4,000)    
Contract with customer - asset - 2023   (4,000)    
Contract with customer - liability   98,000 $ 98,000  
Lease commission recognized upon tenant opening (as a percent) 50.00%      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Contract with customer - liability   $ (49,000)    
Expected timing of satisfaction of remaining performance obligation   3 months    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-02        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Contract with customer - liability   $ (981,000)    
Expected timing of satisfaction of remaining performance obligation   5 years    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Contract with customer - liability   $ (49,000)    
Expected timing of satisfaction of remaining performance obligation   1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Contract with customer - liability   $ 0    
Expected timing of satisfaction of remaining performance obligation   1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Contract with customer - liability   $ 0    
Expected timing of satisfaction of remaining performance obligation   1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Contract with customer - liability   $ (4,899,000)    
Expected timing of satisfaction of remaining performance obligation   15 years    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2038-10-01        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Contract with customer - liability   $ (33,581,000)    
Expected timing of satisfaction of remaining performance obligation   0 years    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2038-10-02        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Contract with customer - liability   $ (39,461,000)    
Expected timing of satisfaction of remaining performance obligation