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FAIR VALUE MEASUREMENTS - Long-Lived Assets Measured at Fair Value (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) mall vacantlandparcel | Dec. 31, 2019 USD ($) mall community_center | Dec. 31, 2018 USD ($) mall
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment | $ 213,358 | $ 239,521 | $ 174,529
Number of malls with impairment | mall | 6 | 6 | 5
Number of vacant land parcel | vacantlandparcel | 1 |  |
Long-lived assets | $ 268,830 | $ 199,740 | $ 91,841
Number of community center with impairment | community_center |  | 1 |
Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment | $ 213,358 |  |
Number of malls with impairment | mall | 6 |  |
Long-lived assets | $ 268,830 |  |
Burnsville Center | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment | 26,562 |  |
Long-lived assets | $ 47,300 |  |
Burnsville Center | Malls | Measurement Input, Expected Term |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Holding period | 10 years |  |
Burnsville Center | Malls | Cap Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) | 14.5 |  |
Burnsville Center | Malls | Discount Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) | 15.5 |  |
Monroeville Mall | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment | $ 107,082 |  |
Long-lived assets | $ 67,000 |  |
Monroeville Mall | Malls | Measurement Input, Expected Term |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Holding period | 10 years |  |
Monroeville Mall | Malls | Cap Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) | 14.0 |  |
Monroeville Mall | Malls | Discount Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) | 14.5 |  |
Asheville Mall | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment | $ 13,274 |  |
Long-lived assets | $ 52,600 |  |
Asheville Mall | Malls | Measurement Input, Expected Term |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Holding period | 10 years |  |
Asheville Mall | Malls | Cap Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) | 13.25 |  |
Asheville Mall | Malls | Discount Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) | 14.0 |  |
Vacant Land | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment | $ 46 |  |
EastGate Mall | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment | 5,980 | $ 33,265 |
Long-lived assets | $ 16,530 | $ 25,100 |
EastGate Mall | Malls | Measurement Input, Expected Term |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Holding period | 10 years | 10 years |
EastGate Mall | Malls | Cap Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) | 17.0 | 14.5 |
EastGate Mall | Malls | Discount Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) | 18.0 | 15.0 |
Greenbrier Mall | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment | $ 8,923 | $ 22,770 |
Long-lived assets | $ 42,500 | $ 56,300 |
Greenbrier Mall | Malls | Measurement Input, Expected Term |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Holding period | 10 years | 10 years |
Greenbrier Mall | Malls | Cap Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) | 12.5 | 11.5 |
Greenbrier Mall | Malls | Discount Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) | 13.0 | 11.5 |
The Outlet Shoppes at Laredo | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment | $ 51,491 |  |
Long-lived assets | $ 42,900 |  |
The Outlet Shoppes at Laredo | Malls | Measurement Input, Expected Term |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Holding period | 10 years |  |
The Outlet Shoppes at Laredo | Malls | Cap Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) | 8.5 |  |
The Outlet Shoppes at Laredo | Malls | Discount Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) | 9.0 |  |
Honey Creek Mall | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment |  | $ 2,045 | 48,640
Long-lived assets |  |  | $ 16,400
Assets book value |  | 14,360 |
Honey Creek Mall | Malls | Measurement Input, Expected Term |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Holding period |  |  | 10 years
Honey Creek Mall | Malls | Cap Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) |  |  | 18.0
Honey Creek Mall | Malls | Discount Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) |  |  | 20.0
The Forum at Grandview | All Other |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment |  | 8,582 |
Assets book value |  | 31,559 |
Mid Rivers Mall | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment |  | 83,621 |
Long-lived assets |  | $ 53,340 |
Mid Rivers Mall | Malls | Measurement Input, Expected Term |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Holding period |  | 10 years |
Mid Rivers Mall | Malls | Cap Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) |  | 12.5 |
Mid Rivers Mall | Malls | Discount Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) |  | 13.25 |
Laurel Park Place | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment |  | $ 52,067 |
Long-lived assets |  | $ 26,000 |
Laurel Park Place | Malls | Measurement Input, Expected Term |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Holding period |  | 10 years |
Laurel Park Place | Malls | Cap Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) |  | 13.5 |
Laurel Park Place | Malls | Discount Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) |  | 14.0 |
Park Plaza Mall | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment |  | $ 37,400 |
Long-lived assets |  | $ 39,000 |
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 (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) |  | 13.0 |
Park Plaza Mall | Malls | Discount Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) |  | 14.0 |
Prior Sales Adjustment | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment |  | $ (229) |
Janesville Mall | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment |  |  | $ 18,061
Assets book value |  |  | 17,640
Cary Towne Center | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment |  |  | 54,678
Long-lived assets |  |  | $ 30,971
Cary Towne Center | Malls | Measurement Input, Expected Term |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Holding period |  |  | 10 years
Cary Towne Center | Malls | Cap Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) |  |  | 12.0
Cary Towne Center | Malls | Discount Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) |  |  | 13
D'Ibervilee, MS - Land | All Other |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment |  |  | $ 14,598
Long-lived assets |  |  | 8,100
Assets book value |  |  | 8,100
Acadania Mall - Macy's & Land | Malls And All Other |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment |  |  | 1,593
Long-lived assets |  |  | 3,920
Assets book value |  |  | 3,920
Eastland Mall | Malls |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment |  |  | 36,525
Long-lived assets |  |  | $ 26,450
Eastland Mall | Malls | Measurement Input, Expected Term |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Holding period |  |  | 10 years
Eastland Mall | Malls | Cap Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) |  |  | 15.0
Eastland Mall | Malls | Discount Rate (as a percent) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Fair value measurement input (as a percent) |  |  | 17.0
Pavilion at Port Orange - Land | All Other |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Loss on impairment |  |  | $ 434
Long-lived assets |  |  | $ 6,000

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