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Dispositions and Impairment - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
property
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
property
Jun. 30, 2018
USD ($)
Dec. 31, 2018
property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of real estate properties held for sale | property 7   7   2
Asset impairment charges $ 1,094 $ 35,269 $ 1,682 $ 88,318  
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    
Overland Park, Kansas          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Asset impairment charges       17,906  
Kansas City, Missouri          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Asset impairment charges       5,591  
Memphis, Tennessee          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Asset impairment charges       25,585  
Transferred Property | Office Building          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Aggregate gross disposition price     120,328 128,324  
Sold Properties          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain on sale of properties     $ 36,201 $ 37,206