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Fair Value Measurements (Narrative) (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
property
Dec. 31, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of fixed rate mortgage loans payable $ 46,500,000 $ 47,000,000.0
Carrying value of fixed rate mortgage payable $ 45,100,000 45,400,000
Number of properties | property 53  
Real estate held for sale $ 49,091,000 $ 9,498,000
Level 2 [Member] | Retail Properties [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of properties | property 1  
Nonrecurring Basis [Member] | Level 3 [Member] | Assets [Member] | Retail Properties [Member] | Direct Capitalization Approach [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of properties | property 1  
Real estate held for sale $ 2,200,000  
Nonrecurring Basis [Member] | Level 3 [Member] | Assets [Member] | Retail Properties [Member] | Direct Capitalization Approach [Member] | Measurement Input Cap Rate [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Capitalization rate 8.50%  
Nonrecurring Basis [Member] | Level 3 [Member] | Assets [Member] | Retail Properties [Member] | Discounted Cash Flow Approach [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of properties | property 1  
Real estate held for sale $ 7,500,000  
Nonrecurring Basis [Member] | Level 3 [Member] | Assets [Member] | Retail Properties [Member] | Discounted Cash Flow Approach [Member] | Measurement Input Cap Rate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Capitalization rate 11.50%  
Nonrecurring Basis [Member] | Level 3 [Member] | Assets [Member] | Retail Properties [Member] | Discounted Cash Flow Approach [Member] | Measurement Input Discount Rate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Discount rate 8.00%