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Leases - Operating Leases - Additional Information (Details)
$ in Thousands
 12 Months Ended
Jan. 01, 2019
item
Dec. 31, 2019
USD ($)
item
shopping_center
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Operating Leased Assets [Line Items]        
Variable lease revenues   $ 56,400    
Cumulative effect adjustment to retained earnings required upon adoption of the new standard   0    
Operating lease, right-of-use asset   $ 60,006    
Number of operating lease | item   9    
Number of finance lease | item   4    
Finance lease, right-of-use asset   $ 102,055    
Number of shopping centers with land leases | shopping_center   6    
Ground lease expense     $ 1,700 $ 1,400
Rent expense capitalized     0 100
Rent expense     1,000 1,000
Capital lease term   49 years    
565 Broadway | Core Portfolio        
Operating Leased Assets [Line Items]        
Operating lease, right-of-use asset   $ 4,900    
Finance lease, right-of-use asset   19,400    
110 University Place        
Operating Leased Assets [Line Items]        
Operating lease, right-of-use asset   45,300    
Operating lease liabilities   45,300    
Capital Lease Liability        
Operating Leased Assets [Line Items]        
Finance lease liabilities   71,100    
Repayments capital lease obligations     $ 2,500 $ 2,500
Ground, Office and Equipment Leases        
Operating Leased Assets [Line Items]        
Operating lease, right-of-use asset   82,600    
Operating lease liabilities   76,600    
Capital Leases Asset        
Operating Leased Assets [Line Items]        
Finance lease, right-of-use asset   77,000    
Accounting Standards Update 2016-02        
Operating Leased Assets [Line Items]        
Operating lease, right-of-use asset   11,900    
Operating lease liabilities   12,800    
Number of finance lease | item 3      
Finance lease, right-of-use asset   $ 5,700    
Minimum        
Operating Leased Assets [Line Items]        
Operating lease term   1 month    
Period of lease term     25 years  
Maximum        
Operating Leased Assets [Line Items]        
Operating lease term   60 years    
Period of lease term     71 years