Quarterly report pursuant to Section 13 or 15(d)

Real Estate Impairment - Impairment Expenses (Details)

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Real Estate Impairment - Impairment Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment of assets held for sale $ 0 $ 400 $ 600 $ 1,547
Columbia Fire Station        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment of assets held for sale 0 0 600 0
St. Matthews        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment of assets held for sale 0 400 0 400
Perimeter Square        
Impaired Long-Lived Assets Held and Used [Line Items]        
Impairment of assets held for sale $ 0 $ 0 $ 0 $ 1,147