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Subsequent Events (Details)
$ / shares in Units, ft² in Thousands, $ in Thousands
9 Months Ended
Oct. 30, 2019
$ / shares
Oct. 28, 2019
USD ($)
ft²
$ / ft²
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Subsequent Event [Line Items]        
Net sales proceeds from wholly-owned properties     $ 180,975 $ 419,554
Subsequent Event        
Subsequent Event [Line Items]        
Common stock dividends (in dollars per share) | $ / shares $ 0.21      
Subsequent Event | West Monroe Street        
Subsequent Event [Line Items]        
Net sales proceeds from wholly-owned properties   $ 412,000    
Proceeds from sale of real estate assets | $ / ft²   (426)    
Area of real estate property (in sq ft) | ft²   967    
Leased percentage of real estate asset   100.00%