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Fair Value Measurements - Long-Lived Assets Measured at Fair Value (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loss on impairment $ 13,274,000 $ 41,608,000 $ 146,918,000 $ 66,433,000
Long-lived assets 166,900,000 127,319,000 166,900,000 127,319,000
Malls        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loss on impairment 13,274,000   146,918,000  
Burnsville Center | Malls        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loss on impairment     26,562,000  
Long-lived assets $ 47,300,000   $ 47,300,000  
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   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   15.5  
Monroeville Mall | Malls        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loss on impairment     $ 107,082,000  
Long-lived assets $ 67,000,000   $ 67,000,000  
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   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   14.5  
Asheville Mall | Malls        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loss on impairment     $ 13,274,000  
Long-lived assets $ 52,600,000   $ 52,600,000  
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   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   14.0  
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   56,300,000
Honey Creek Mall | Malls        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loss on impairment       2,045,000
Long-lived assets   14,360,000   14,360,000
Assets book value   14,360,000   14,360,000
The Forumat Grandview | Malls        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Assets book value   31,559,000   31,559,000
The Forumat Grandview | All Other        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loss on impairment       8,582,000
Long-lived assets   31,559,000   31,559,000
Eastgate Mall | Malls        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loss on impairment       33,265,000
Long-lived assets   $ 25,100,000   $ 25,100,000
Eastgate Mall | Malls | Measurement Input, Expected Term        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Holding period       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)   14.5   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)   15.0   15.0
Prior Sales Adjustment | Malls        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Loss on impairment       $ (229,000)
Greenbriar Mall | Malls | Measurement Input, Expected Term        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Holding period       10 years
Greenbriar 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)   11.5   11.5
Greenbriar 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)   11.5   11.5