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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
segment
property
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Number of reportable segments | segment 3    
Net cash provided by (used in) investing activities $ (26,279,000) $ (39,303,000)  
Net cash provided by (used in) operating activities 22,939,000 24,489,000  
Capitalized acquisition costs $ 100,000    
Acquisition costs expensed   300,000  
Accounting Standards Update 2014-09      
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Cumulative effect of new accounting principle during period     $ 0
Accounting Standards Update 2016-15      
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Net cash provided by (used in) investing activities   7,300,000  
Net cash provided by (used in) operating activities   (7,300,000)  
Accounting Standards Update 2016-18      
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Net cash provided by (used in) operating activities   (1,000,000)  
Increase (decrease) in cash and cash equivalents   1,000,000  
Operating Partnership, as General Partner or Managing Member      
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Equity interest held by Operating Partnership 94.00%   95.00%
Remaining funds rate of distribution to operating partnership (in percent) 20.00%    
Institutional Investors      
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Remaining funds rate of distribution to all partners (in percent) 80.00%    
Core Portfolio      
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Number of retail properties | property 118    
Properties owned percentage 100.00%    
Acquisition costs expensed   $ 200,000  
Opportunity Funds      
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Number of retail properties | property 57    
Core Portfolio and Opportunity Funds      
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Number of retail properties | property 175