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Real Estate - Dispositions (Details) - Discontinued Operations, Disposed of by Sale
ft² in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2019
USD ($)
a
Dec. 31, 2020
USD ($)
ft²
property
Dec. 31, 2019
property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of real estate properties | property   2 0
Gain on sale of property   $ 90,300  
Tax effect of discontinued operation   $ 459  
Hearst Tower      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Square Feet | ft²   966  
Sales Price   $ 455,500  
Woodcrest      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Square Feet | ft²   386  
Sales Price   $ 25,300  
Downtown Atlanta, Georgia      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Square Feet | a 8    
Sales Price $ 13,300    
Gain on sale of property $ 13,100