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Fair Value Measurements - Impairment of Real Estate Properties (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) yr | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) yr mall | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) yr
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loss on impairment | $ 14,600 | $ 24,935 | $ 84,644 | $ 71,401 | $ 67,532
Number of malls with impairment | mall |  |  | 2 |  |
Fair Value | 42,100 |  | $ 42,100 |  | 81,350
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 |  |
Outlet Mall and Outparcel Sale |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loss on impairment |  |  | 84,644 |  |
Janesville Mall |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Net sales price | 17,640 |  | 17,640 |  |
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 |  |
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 |  |
Vacant land | 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 |  |
Acadiana Mall | Malls |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loss on impairment |  |  |  |  | 43,007
Fair Value |  |  |  |  | 67,300
Fair value of equity method investments |  |  |  |  | 67,300
Hickory Point Mall | Malls |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loss on impairment |  |  |  |  | 24,525
Fair Value |  |  |  |  | $ 14,050
Expected Term | Cary Towne Center | Malls |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value measurement input | yr | 10 |  | 10 |  |
Expected Term | Acadiana Mall | Malls |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value measurement input | yr |  |  |  |  | 10
Expected Term | Hickory Point Mall | Malls |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value measurement input | yr |  |  |  |  | 10
Cap Rate | Cary Towne Center | Malls |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value measurement input | 0.120 |  | 0.120 |  |
Cap Rate | Acadiana Mall | Malls |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value measurement input |  |  |  |  | 0.155
Cap Rate | Hickory Point Mall | Malls |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value measurement input |  |  |  |  | 0.180
Discount Rate | Cary Towne Center | Malls |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value measurement input | 0.13 |  | 0.13 |  |
Discount Rate | Acadiana Mall | Malls |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value measurement input |  |  |  |  | 0.1575
Discount Rate | Hickory Point Mall | Malls |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value measurement input |  |  |  |  | 0.190

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