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Combined Guarantor Subsidiaries - Fair Value Measurements - Impairment of Real Estate Properties (Details) - Guarantor Subsidiaries | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loss on impairment | $ 60,170,000 | $ 0 | $ 43,007,000
Long-lived assets | 95,300,000 |  | 67,300,000
Malls |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loss on impairment | 60,170,000 |  |
Long-lived assets | 95,300,000 |  |
Greenbrier Mall | Malls |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loss on impairment | 22,770,000 |  |
Long-lived assets | $ 56,300,000 |  |
Greenbrier Mall | Malls | Measurement Input, 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) | 11.0 |  |
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) | 11.5 |  |
Park Plaza Mall | Malls |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loss on impairment | $ 37,400,000 |  |
Long-lived assets | $ 39,000,000 |  |
Park Plaza Mall | Malls | Measurement Input, Expected Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Holding period | 10 years |  |
Park Plaza Mall | Malls | Cap Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) | 15.0 |  |
Park Plaza Mall | Malls | Discount Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) | 14.0 |  |
Acadiana Mall | Malls |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loss on impairment |  |  | 43,007,000
Long-lived assets |  |  | $ 67,300,000
Acadiana Mall | Malls | Measurement Input, Expected Term |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Holding period |  |  | 10 years
Acadiana Mall | Malls | Cap Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) |  |  | 15.5
Acadiana Mall | Malls | Discount Rate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) |  |  | 15.75

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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=118932676&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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