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Fair Value Measurements - Long-Lived Assets Measured at Fair Value (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Loss on impairment | $ 46 | $ 135,688 | $ 146,964 | $ 202,121
Long-lived assets | 166,900 | 160,740 | 166,900 | 160,740
Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Loss on impairment |  |  | 146,964 |
Burnsville Center | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Loss on impairment |  |  | 26,562 |
Long-lived assets | $ 47,300 |  | $ 47,300 |
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 |  | 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 |  | 15.5 |
Monroeville Mall | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Loss on impairment |  |  | $ 107,082 |
Long-lived assets | $ 67,000 |  | $ 67,000 |
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 |  | 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 |  | 14.5 |
Asheville Mall | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Loss on impairment |  |  | $ 13,274 |
Long-lived assets | $ 52,600 |  | $ 52,600 |
Asheville Mall | Malls | Measurement Input, Expected Term |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Holding period |  |  | 10 years |
Asheville 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) | 13.25 |  | 13.25 |
Asheville 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) | 14.0 |  | 14.0 |
Vacant Land | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Loss on impairment |  |  | $ 46 |
Greenbrier Mall | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Loss on impairment |  |  |  | 22,770
Long-lived assets |  | 56,300 |  | 56,300
Honey Creek Mall | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Loss on impairment |  |  |  | 2,045
Assets book value |  | 14,360 |  | 14,360
The Forumat Grandview | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Assets book value |  | 31,559 |  | 31,559
The Forumat Grandview | All Other |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Loss on impairment |  |  |  | 8,582
Eastgate Mall | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Loss on impairment |  |  |  | 33,265
Long-lived assets |  | $ 25,100 |  | $ 25,100
Eastgate Mall | Malls | Measurement Input, Expected Term |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Holding period |  |  |  | 10 years
Eastgate 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) |  | 14.5 |  | 14.5
Eastgate 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) |  | 15.0 |  | 15.0
Mid Rivers Mall | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Loss on impairment |  |  |  | $ 83,621
Long-lived assets |  | $ 53,340 |  | $ 53,340
Mid Rivers Mall | Malls | Measurement Input, Expected Term |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Holding period |  |  |  | 10 years
Mid Rivers 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) |  | 12.5 |  | 12.5
Mid Rivers 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) |  | 13.25 |  | 13.25
Laurel Park Place | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Loss on impairment |  |  |  | $ 52,067
Long-lived assets |  | $ 26,000 |  | $ 26,000
Laurel Park Place | Malls | Measurement Input, Expected Term |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Holding period |  |  |  | 10 years
Laurel Park Place | 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) |  | 13.5 |  | 13.5
Laurel Park Place | 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) |  | 14.0 |  | 14.0
Prior Sales Adjustment | Malls |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Loss on impairment |  |  |  | $ (229)
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 |  | 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 |  | 11.5

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