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Subsequent Events - (Details) - Retail - Disposal Group, Disposed of by Sale, Not Discontinued Operations
$ in Thousands
Oct. 11, 2019
USD ($)
ft²
Sep. 30, 2019
ft²
Sep. 30, 2018
ft²
Subsequent Event [Line Items]      
Square Feet   1,151,500 2,232,000
Northwest Marketplace | Subsequent Event      
Subsequent Event [Line Items]      
Square Feet 185,000    
Gross Disposition Price | $ $ 29,500