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Dispositions and Impairment - Additional Information (Details)
$ in Thousands
1 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2019
USD ($)
Dec. 31, 2018
Property
property
Feb. 28, 2017
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Property
Dec. 31, 2018
USD ($)
building
Property
Dec. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from sale of property         $ 504,118 $ 898,514 $ 223,853
Aggregate gain on sale of properties         250,889 252,913 63,428
Gain (loss) on debt extinguishment on sale of properties         $ (4,415) $ (1,698) 5,938
Properties classified as held-for-sale (in number of properties) | Property   2     0 2  
Other asset impairment charges         $ 5,329 $ 95,813 39,702
Impairment charges and loan losses         2,974 36,620  
Impairment losses related to real estate partnerships     $ 5,294        
Office Building              
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
NNN Office Joint Venture Properties              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Aggregate gain on sale of properties $ 824       3,529    
NNN Office Joint Venture Properties | Transferred Property | Office Building              
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  
Watertown, New York              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Asset impairment charges         $ 2,106   $ 18,023
Albany, Georgia              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Asset impairment charges       $ 249