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Commitments and Contingencies - Property Damage from Natural and Other Disaster (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Apr. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Loss Contingencies [Line Items]      
Net recoveries   $ 0 $ 3,994
Jacksonville Mall, Jacksonville, North Carolina      
Loss Contingencies [Line Items]      
Net recoveries     200
Business interruption recoveries     $ 100
Cherry Hill Mall in Cherry Hill, New Jersey      
Loss Contingencies [Line Items]      
Business interruption recoveries $ 600    
Net cost   $ 600