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Dispositions (Details)
ft² in Thousands, $ in Thousands
12 Months Ended
Aug. 31, 2018
USD ($)
May 17, 2018
USD ($)
ft²
Nov. 16, 2017
USD ($)
ft²
Jan. 18, 2017
USD ($)
ft²
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from sale $ 142,500            
(Loss) gain on sale or write down of assets, net         $ (11,909) $ (31,825) $ 42,446
Cascade Mall              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Property area (in square feet) | ft²       589      
Northgate Mall              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Property area (in square feet) | ft²       750      
Cascade and Northgate Malls              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from sale       $ 170,000      
Gain (loss) on disposal             $ 59,577
500 North Michigan Avenue              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Property area (in square feet) | ft²     326        
Proceeds from sale     $ 86,350        
Gain (loss) on disposal     $ 14,597        
Promenade at Casa Grande              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Property area (in square feet) | ft²   761          
Proceeds from sale   $ 26,000          
(Loss) gain on sale or write down of assets, net   $ (311)