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Dispositions and Impairment - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
property
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
number_of_impairmentCharges
property
Jun. 30, 2019
USD ($)
Dec. 31, 2019
property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Debt satisfaction gain     $ 1,393    
Number of real estate properties held for sale | property 1   1   0
Number of impairment charges | number_of_impairmentCharges     1    
Asset impairment charges $ 1,617 $ 1,094 $ 1,617 $ 1,682  
Transferred Property | Office Building          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Aggregate gross disposition price     74,064 120,328  
Sold Properties          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on sale of properties     $ 20,998 36,201  
Watertown, New York          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Asset impairment charges       1,433  
Albany, Georgia          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Asset impairment charges       $ 249