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Fair Value Measurements (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) property | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of fixed rate mortgage loans payable | $ 159,000,000.0 | $ 47,000,000.0 |
Carrying value of fixed rate mortgage payable | 156,800,000 | 45,400,000 |
Impairment charges | 99,888,000 | 7,607,000 | $ 8,938,000
Aggregate fair value of impairment charges | $ 194,500,000 |  |
Number of properties | property | 50 |  |
Real estate held for sale | $ 73,251,000 | $ 9,498,000 |
Level 2 [Member] | Assets [Member] | Retail Properties [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment charges | $ 18,500,000 |  |
Number of properties | property | 4 |  |
Real estate held for sale | $ 73,300,000 |  |
Dual-track Strategic Alternatives Process [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment charges | $ 83,200,000 |  |

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