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Dispositions and Impairment - Additional Information (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2018
Property
property
Feb. 28, 2017
USD ($)
Dec. 31, 2018
USD ($)
building
Property
Dec. 31, 2017
USD ($)
Property
Dec. 31, 2016
USD ($)
Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of property     $ 898,514 $ 223,853 $ 370,038
Aggregate gain on sale of properties     252,913 63,428 81,510
Gain (loss) on debt extinguishment on sale of properties     $ (1,698) $ 5,938 (532)
Properties classified as held-for-sale (in number of properties) | Property 2   2 1  
Other asset impairment charges     $ 95,813 $ 39,702 $ 100,195
Impairment charges on real estate     36,620 18,023  
Impairment losses related to real estate partnerships   $ 5,294      
Office Building [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Aggregate gain on sale of properties   $ 1,777      
Number of properties sold | property 6        
Asset impairment charges     23,496 $ 15,008  
Land [Member] | New York, New York [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of properties sold | Property         3
Impairment charges on real estate         $ 65,500
NNN Office Joint Venture Properties [Member] | Transferred Property [Member] | Office Building [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of property     $ 725,800    
Number of properties sold | building     21