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Dispositions and Impairment - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
property
Mar. 31, 2019
USD ($)
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   0
Asset impairment charges $ 0 $ 588  
Transferred Property | Office Building      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Aggregate gross disposition price 29,605 79,300  
Sold Properties      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on sale of properties $ 9,805 20,957  
Watertown, New York      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Asset impairment charges   339  
Albany, Georgia      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Asset impairment charges   $ 249