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Summary of Significant Accounting Policies - Intangibles (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Intangible Assets      
Unamortized below market leases included in accounts payable, accrued expenses, intangibles and deferred revenues $ 44,800 $ 66,700  
Estimated future amortization, and the increasing (decreasing) effect on below market minimum rents      
2020 16,943    
2021 7,970    
2022 5,348    
2023 4,063    
2024 3,151    
Thereafter 7,302    
Lease intangibles assets, net 44,777    
Estimated future amortization, and the increasing (decreasing) effect on minimum rents      
2020 1,301    
2021 (2,256)    
2022 (2,073)    
2023 (1,325)    
2024 (494)    
Thereafter 5,287    
Lease intangibles assets, net $ 440    
In-place lease intangibles      
Intangible Assets      
Average life of in-place lease intangibles 2 years    
Lease intangibles assets, gross $ 196,007 291,613  
Accumulated amortization (164,590) (225,788)  
Lease intangibles assets, net $ 31,417 65,825  
Above and below market leases      
Intangible Assets      
Weighted average remaining life of intangible 2 years 7 months 6 days    
Amount of amortization expenses $ 1,900 1,000 $ 2,800
Above Market Leases      
Intangible Assets      
Lease intangibles assets, gross 252,934 253,973  
Accumulated amortization (208,597) (189,160)  
Lease intangibles assets, net 44,337 $ 64,813  
Estimated future amortization, and the increasing (decreasing) effect on minimum rents      
2020 (15,642)    
2021 (10,226)    
2022 (7,421)    
2023 (5,388)    
2024 (3,645)    
Thereafter (2,015)    
Lease intangibles assets, net $ (44,337)