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Deferred Leasing Costs and Lease Intangibles, net - Future Amortization Expense For Finitle-lived Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Amortization of above- and below-market leases, net $ (18,062) $ (19,734) $ (22,073)
Deferred leasing costs and lease intangibles, net (244,554) (288,929)  
Above-market leases      
Finite-Lived Intangible Assets [Line Items]      
Amortization of above- and below-market leases, net (6,953) (11,259) (12,534)
2018 (1,529)    
2019 (1,014)    
2020 (466)    
2021 (327)    
2022 (106)    
Thereafter (49)    
Deferred leasing costs and lease intangibles, net (3,491) (10,430)  
Deferred leasing costs and in-place lease intangibles      
Finite-Lived Intangible Assets [Line Items]      
Amortization of above- and below-market leases, net (72,883) (84,492) (91,965)
2018 (41,300)    
2019 (31,533)    
2020 (22,966)    
2021 (18,224)    
2022 (13,068)    
Thereafter (52,082)    
Deferred leasing costs and lease intangibles, net (179,173) (213,977)  
Below-market ground leases      
Finite-Lived Intangible Assets [Line Items]      
Amortization of above- and below-market leases, net (2,548) (2,203) $ (1,688)
2018 (2,410)    
2019 (2,410)    
2020 (2,410)    
2021 (2,410)    
2022 (2,410)    
Thereafter (49,840)    
Deferred leasing costs and lease intangibles, net $ (61,890) $ (64,522)