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Dispositions and Impairment - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
term
property
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
impairment_charge
term
property
Sep. 30, 2019
USD ($)
Dec. 31, 2019
property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of properties disposed | term 135   135    
Debt satisfaction gain     $ 29,016 $ 4,415  
Number of real estate properties held for sale | property 5   5   0
Number of impairment charges | impairment_charge     2    
Asset impairment charges $ 6,175 $ 673 $ 7,792 2,355  
Properties in Charleston, SC and Overland Park, KS | Disposal Group, Disposed of by Sale, Not Discontinued Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of properties disposed | property 2   2    
Transferred Property | Office Building          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Aggregate gross disposition price     $ 140,573 448,900  
Sold Properties          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on sale of properties     41,876 176,662  
Houston, TX          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Asset impairment charges     1,617    
Watertown, New York          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Asset impairment charges       2,106  
Albany, Georgia          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Asset impairment charges       $ 249  
Kalamazoo, Michigan          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Asset impairment charges     $ 6,175