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Fair Value Measurements (Narrative) (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) property | Dec. 31, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of fixed rate mortgage loans payable | $ 45,200,000 | $ 127,700,000
Carrying value of fixed rate mortgage payable | $ 47,500,000 | 128,000,000
Number of properties | property | 58 |
Real estate held for sale | $ 11,348,000 |
Nonrecurring Basis [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets measured at fair value |  | $ 0
Nonrecurring Basis [Member] | Level 3 [Member] | Assets [Member] | Retail Properties [Member] | Income 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 | $ 1,600,000 |
Nonrecurring Basis [Member] | Level 3 [Member] | Assets [Member] | Retail Properties [Member] | Income Capitalization Approach [Member] | Measurement Input Cap Rate [Member] | Minimum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Capitalization rates | 8.50% |

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