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Fair Value Measurements - Impairment of Real Estate Properties (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Loss on Impairment |  | $ 135,688 | $ 14,600 | $ 202,121 | $ 84,644 |  |
Fair Value |  | 160,740 | 42,100 | 160,740 | 42,100 |  |
Malls |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Loss on Impairment |  |  |  |  | 84,644 |  |
Fair Value |  |  | 42,100 |  | 42,100 |  |
Greenbrier Mall | Malls |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Loss on Impairment |  |  |  | 22,770 |  |  |
Fair Value |  | $ 56,300 |  | $ 56,300 |  |  |
Greenbrier Mall | Malls | Expected Term |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Holding period |  |  |  | 10 years |  |  |
Greenbrier Mall | Malls | Cap Rate |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value measurement input (as a percent) |  | 0.110 |  | 0.110 |  |  |
Greenbrier Mall | Malls | Discount Rate |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value measurement input (as a percent) |  | 0.115 |  | 0.115 |  |  |
Honey Creek Mall | Malls |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Loss on Impairment | $ (239) |  |  | $ 2,045 |  |  |
Fair Value |  | $ 0 |  | 0 |  |  | $ 14,360
The Forum at Grandview | All Other |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Loss on Impairment |  |  |  | 8,582 |  |  |
Fair Value |  | 0 |  | 0 |  | $ 31,559 |
EastGate Mall | Malls |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Loss on Impairment |  |  |  | 33,265 |  |  |
Fair Value |  | $ 25,100 |  | $ 25,100 |  |  |
EastGate Mall | Malls | Expected Term |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Holding period |  |  |  | 10 years |  |  |
EastGate Mall | Malls | Cap Rate |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value measurement input (as a percent) |  | 0.145 |  | 0.145 |  |  |
EastGate Mall | Malls | Discount Rate |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value measurement input (as a percent) |  | 0.150 |  | 0.150 |  |  |
Mid Rivers Mall | Malls |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Loss on Impairment |  |  |  | $ 83,621 |  |  |
Fair Value |  | $ 53,340 |  | $ 53,340 |  |  |
Mid Rivers Mall | Malls | 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 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value measurement input (as a percent) |  | 0.125 |  | 0.125 |  |  |
Mid Rivers Mall | Malls | Discount Rate |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value measurement input (as a percent) |  | 0.1325 |  | 0.1325 |  |  |
Laurel Park Place | Malls |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Loss on Impairment |  |  |  | $ 52,067 |  |  |
Fair Value |  | $ 26,000 |  | $ 26,000 |  |  |
Laurel Park Place | Malls | 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 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value measurement input (as a percent) |  | 0.135 |  | 0.135 |  |  |
Laurel Park Place | Malls | Discount Rate |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value measurement input (as a percent) |  | 0.140 |  | 0.140 |  |  |
Prior period adjustments | Malls |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Loss on Impairment |  |  |  | $ (229) |  |  |
Fair Value |  | $ 0 |  | $ 0 |  |  |
Janesville Mall | Malls |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Loss on Impairment |  |  |  |  | 18,061 |  |
Fair Value |  |  | 0 |  | 0 |  |
Fair value of equity method investment |  |  | 17,640 |  | 17,640 |  |
Cary Towne Center | Malls |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Loss on Impairment |  |  |  |  | 51,985 |  |
Fair Value |  |  | 34,000 |  | 34,000 |  |
Cary Towne Center | Malls | Expected Term |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Holding period |  |  |  | 10 years |  |  |
Cary Towne Center | Malls | Cap Rate |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value measurement input (as a percent) |  | 0.120 |  | 0.120 |  |  |
Cary Towne Center | Malls | Discount Rate |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Fair value measurement input (as a percent) |  | 0.13 |  | 0.13 |  |  |
Vacant land | All Other |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Loss on Impairment |  |  |  |  | 14,598 |  |
Fair Value |  |  | $ 8,100 |  | $ 8,100 |  |

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