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Property Dispositions and Assets Held for Sale - Property Dispositions (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Oct. 28, 2020
USD ($)
extension
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Notes receivable $ 118,500 $ 118,500    
Real Estate Loan | Secured Notes Receivable        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Notes receivable       $ 102,800
Notes receivable, interest rate       6.00%
Notes receivable, number of extension terms | extension       3
Notes receivable, extension term duration 1 year      
Real Estate Loan | Mezzanine Note Receivable        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Notes receivable       $ 15,700
Notes receivable, interest rate       13.55%
Disposal Group, Disposed of by Sale, Not Discontinued Operations | One Independence Square        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on Sale of Real Estate Assets     $ 33,176  
Net Sales Proceeds     163,623  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | The Dupree        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on Sale of Real Estate Assets     0  
Net Sales Proceeds     12,631  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 500 West Monroe Street        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on Sale of Real Estate Assets     157,739  
Net Sales Proceeds     $ 408,851  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 1901 Market Street        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on Sale of Real Estate Assets   191,030    
Net Sales Proceeds   350,805    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | New Jersey Portfolio        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on Sale of Real Estate Assets   14,636    
Net Sales Proceeds   $ 9,289