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Deferred Leasing Costs and Lease Intangibles, net - Future Amortization Expense For Finite-lived Intangible Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Intangible Liability, Amortization Expense, Maturity Schedule [Line Items]      
Amortization of above- and below-market leases, net $ (18,062) $ (19,734) $ (22,073)
Off-market leases, net 49,930 73,267  
Below-market leases      
Intangible Liability, Amortization Expense, Maturity Schedule [Line Items]      
Amortization of above- and below-market leases, net 25,015 30,993 34,607
2018 14,713    
2019 11,317    
2020 8,514    
2021 6,084    
2022 3,575    
Thereafter 4,765    
Off-market leases, net 48,968 72,261  
Above-market ground leases      
Intangible Liability, Amortization Expense, Maturity Schedule [Line Items]      
Amortization of above- and below-market leases, net 43 43 $ 46
2018 43    
2019 43    
2020 43    
2021 43    
2022 43    
Thereafter 747    
Off-market leases, net $ 962 $ 1,006