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Dispositions and Impairment - Additional Information (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
property
Mar. 31, 2018
USD ($)
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 5   2
Real estate impairment charges $ 588 $ 53,049  
Asset impairment charges 588 53,049  
Watertown, New York [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Asset impairment charges 339    
Albany, Georgia [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Asset impairment charges 249    
Overland Park, Kansas [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Asset impairment charges   17,906  
Memphis, Tennessee [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Asset impairment charges   25,433  
Transferred Property [Member] | Office Building [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Aggregate gross disposition price 79,300 62,675  
Sold Properties [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on sale of properties $ 20,957 $ 22,774