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Fair Value Measurements (Narrative) (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 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 | $ 158,600,000 | $ 47,000,000.0
Carrying value of fixed rate mortgage payable | $ 157,300,000 | 45,400,000
Number of properties | property | 53 |
Real estate held for sale | $ 2,219,000 | $ 9,498,000
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% |

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