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Combined Guarantor Subsidiaries - Fair Value Measurements - Impairment of Real Estate Properties (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loss on Impairment | $ 24,825 | $ 18,061
Fair Value | 70,800 | 0
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 |
Equity method investments at fair value | $ 56,300 |
Cap Rate | Greenbrier Mall | Malls |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value measurement input | 0.110 |
Discount Rate | Greenbrier Mall | Malls |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value measurement input | 0.115 |
Guarantor Subsidiaries |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loss on Impairment | $ 22,770 | $ 0
Fair Value | 56,300 |
Guarantor Subsidiaries | 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 |
Equity method investments at fair value | $ 56,300 |
Holding period | 10 years |
Guarantor Subsidiaries | Cap Rate | Greenbrier Mall | Malls |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value measurement input | 0.110 |
Guarantor Subsidiaries | Discount Rate | Greenbrier Mall | Malls |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value measurement input | 0.115 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 + Details
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