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Organization, Basis of Presentation and Summary of Significant Accounting Policies (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
segment
property
Dec. 31, 2016
Dec. 31, 2014
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Number of reporting units | segment 3    
Capitalized internal leasing costs | $ $ 0.2   $ 0.3
Operating Partnership, as General Partner or Managing Member [Member]      
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Equity Interest Held By Operating Partnership (b) 95.00% 95.00%  
Remaining funds rate of distribution to operating partnership (in percent) 20.00%    
Institutional Investors [Member]      
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Remaining funds rate of distribution to all partners (in percent) 80.00%    
Core Portfolio [Member]      
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Number of retail properties 118    
Properties owned percentage 100.00%    
Opportunity Funds      
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Number of retail properties 64    
Core Portfolio and Opportunity Funds [Member]      
Organization, Consolidation and Presentation of Financial Statements [Line Items]      
Number of retail properties 182