Annual report pursuant to Section 13 and 15(d)

Real Estate Impairment - Impairment Expenses (Details)

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Real Estate Impairment - Impairment Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Impaired Long-Lived Assets Held and Used [Line Items]    
Impairment of assets held for sale $ 600 $ 1,598
Columbia Fire Station    
Impaired Long-Lived Assets Held and Used [Line Items]    
Impairment of assets held for sale 600 0
St. Matthews    
Impaired Long-Lived Assets Held and Used [Line Items]    
Impairment of assets held for sale 0 451
Perimeter Square    
Impaired Long-Lived Assets Held and Used [Line Items]    
Impairment of assets held for sale $ 0 $ 1,147