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Dispositions (Details)
ft² in Thousands, $ in Thousands
12 Months Ended
Aug. 31, 2018
USD ($)
May 17, 2018
USD ($)
ft²
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale $ 142,500        
Loss on sale or write down of assets, net     $ (68,112) $ (11,909) $ (31,825)
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 on sale or write down of assets, net   $ (311)