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Property Dispositions and Real Estate Impairment - Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
property
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
property
Jun. 30, 2016
USD ($)
Dec. 31, 2016
property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Debt satisfaction charges, net $ 46 $ 3,194 $ 46 $ 3,356  
Number of real estate properties held for sale | property 1   1   2
Impairment of assets held-for-use     $ 16,297 3,014  
Transferred Property [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Debt satisfaction charges, net     44 3,321  
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     151,856    
Sold Properties [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Aggregate gross disposition price       166,834  
Gain on sale of properties     $ 44,433 $ 42,341