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Fair Value Measurements (Schedule of Impairment of Real Estate Properties) (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  | $ 24,935 |  | $ 53,558 |  | $ 71,401 | $ 116,736 |
Fair Value | $ 81,350 |  |  | 81,350 |  |  | $ 81,350 | 81,350 |  | $ 81,350
Malls/Office Buildings |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  | 606 |  |  |
Fair Value |  | $ 0 |  |  | $ 0 |  |  |  |  |
Malls |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  | $ 3,147 |  |  |  |  |  |  |
Fair Value |  |  | 0 |  |  |  |  |  |  |
Investment in consolidated joint venture, fair value |  |  | $ 1,000 |  |  |  |  |  |  |
Malls, Office Buildings |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on impairment |  |  |  |  |  |  |  | 71,285 |  |
Fair Value | 81,350 |  |  | 81,350 |  |  | 81,350 | 81,350 |  | $ 81,350
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 |  |  | 67,300 |  |  |  |  |
Investment in consolidated joint venture, fair value |  | $ 67,300 |  |  | $ 67,300 |  |  |  |  |
Holding period |  |  |  |  | 10 years |  |  |  |  |
Capitalization rate |  |  |  |  | 15.50% |  |  |  |  |
Discount rate |  |  |  |  | 15.75% |  |  |  |  |
Percentage of total consolidated revenues |  |  |  |  |  |  |  |  |  | 1.90%
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 |  |  | $ 14,050 |  |  | $ 14,050 | $ 14,050 |  | $ 14,050
Holding period |  |  |  | 10 years |  |  |  |  |  |
Capitalization rate |  |  |  | 18.00% |  |  |  |  |  |
Discount rate |  |  |  | 19.00% |  |  |  |  |  |
Percentage of total consolidated revenues |  |  |  |  |  |  |  |  |  | 0.50%

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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