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Fair Value Measurements - Long-Lived Assets Measured at Fair Value (Details) | 3 Months Ended
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Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Loss on impairment | $ 133,644,000 | $ 24,825,000
Long-lived assets | 114,300,000 | 70,800,000
Malls |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Loss on impairment | 133,644,000 |
Burnsville Center | Malls |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Loss on impairment | 26,562,000 |
Long-lived assets | $ 47,300,000 |
Burnsville Center | Malls | Measurement Input, Expected Term |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Holding period | 10 years |
Burnsville Center | Malls | Cap Rate (as a percent) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value measurement input (as a percent) | 14.5 |
Burnsville Center | Malls | Discount Rate (as a percent) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value measurement input (as a percent) | 15.5 |
Monroeville Mall | Malls |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Loss on impairment | $ 107,082,000 |
Long-lived assets | $ 67,000,000 |
Monroeville Mall | Malls | Measurement Input, Expected Term |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Holding period | 10 years |
Monroeville Mall | Malls | Cap Rate (as a percent) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value measurement input (as a percent) | 14.0 |
Monroeville Mall | Malls | Discount Rate (as a percent) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value measurement input (as a percent) | 14.5 |
Greenbrier Mall | Malls |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Loss on impairment |  | 22,770,000
Long-lived assets |  | 56,300,000
Honey Creek Mall | Malls |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Loss on impairment |  | 2,284,000
Long-lived assets |  | 14,500,000
Assets book value |  | 14,360,000
Prior Sales Adjustment | Malls |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Loss on impairment |  | (229,000)
Greenbriar Mall | Malls |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Long-lived assets |  | $ 56,300,000
Greenbriar Mall | Malls | Measurement Input, Expected Term |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Holding period |  | 10 years
Greenbriar Mall | Malls | Cap Rate (as a percent) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value measurement input (as a percent) |  | 11.5
Greenbriar Mall | Malls | Discount Rate (as a percent) |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value measurement input (as a percent) |  | 11.5

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