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Real Estate Activities - Impairment of Assets (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2022
Real Estate Properties [Line Items]            
Impairment of real estate assets       $ 42,271 $ 1,564  
Cash proceeds from sales of real estate       $ 39,515 4,076  
Valley View Center            
Real Estate Properties [Line Items]            
Impairment loss on assets as held for sale         $ 1,300  
Exton Square Mall            
Real Estate Properties [Line Items]            
Sale price           $ 28,800
Plymouth Meeting Mall            
Real Estate Properties [Line Items]            
Impairment loss on assets as held for sale   $ 37,400        
Cumberland Mall            
Real Estate Properties [Line Items]            
Impairment loss on assets as held for sale   $ 4,800        
Cumberland Mall | Subsequent Event            
Real Estate Properties [Line Items]            
Cash proceeds from sales of real estate $ 44,600          
Monroe Marketplace Land            
Real Estate Properties [Line Items]            
Impairment of real estate assets     $ 300