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Fair Value Measurements (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) outparcel | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Long-term debt, fair value | $ 4,488,714 |  | $ 4,488,714 |  | $ 4,488,714 |  | $ 4,488,714 | $ 4,737,077
Mortgage and other indebtedness, net | 4,249,440 |  | 4,249,440 |  | 4,249,440 |  | 4,249,440 | $ 4,465,294
Fair Value | 67,300 |  | 67,300 |  | 67,300 |  | 67,300 |
Loss on impairment |  |  | 43,203 | $ 43,493 | $ 46,466 | $ 63,178 |  |
Number of outparcels with impairment | outparcel |  |  |  |  | 1 |  |  |
Outlet Mall and Outparcel Sale |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  | $ 46,466 |  |  |
Outparcel Sale |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  | $ 116 |  |  |
Number of properties disposed of | outparcel |  |  |  |  | 1 |  |  |
Malls |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value |  | $ 0 |  |  |  |  |  |
Loss on impairment |  | 3,147 |  |  |  |  |  |
Investment in consolidated joint venture, fair value |  | $ 1,000 |  |  |  |  |  |
Malls | Acadiana Mall |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value | 67,300 |  | 67,300 |  | $ 67,300 |  | 67,300 |
Loss on impairment | 43,007 |  |  |  |  |  |  |
Investment in consolidated joint venture, fair value | 67,300 |  | 67,300 |  | $ 67,300 |  | $ 67,300 |
Holding period (in years) |  |  |  |  | 10 years |  |  |
Capitalization rate (as a percent) |  |  |  |  | 15.50% |  |  |
Discount rate (as a percent) |  |  |  |  | 15.75% |  |  |
Percentage of total consolidated revenues |  |  |  |  |  |  | 1.90% |
Malls/Office Buildings |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value | 0 |  | 0 |  | $ 0 |  | $ 0 |
Loss on impairment | 196 |  |  |  |  |  |  |
Malls, Office Buildings and Acadiana Mall |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value | 67,300 |  | 67,300 |  | 67,300 |  | 67,300 |
Loss on impairment |  |  |  |  | 46,350 |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value | 0 |  | 0 |  | 0 |  | 0 |
Significant Other Observable Inputs (Level 2) |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value | 0 |  | 0 |  | 0 |  | 0 |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value | $ 67,300 |  | $ 67,300 |  | $ 67,300 |  | $ 67,300 |

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