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Deferred Leasing Costs and Lease Intangibles, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]    
Deferred leasing costs and lease intangibles, net $ 279,896 $ 239,029
Intangible Liability, Amortization Expense, Maturity Schedule [Line Items]    
Off-market leases, net 45,612 49,540
Deferred leasing costs and in-place lease intangibles    
Finite-Lived Intangible Assets, Net [Abstract]    
Deferred leasing costs and lease intangibles 336,535 301,945
Accumulated amortization (123,432) (127,703)
Deferred leasing costs and lease intangibles, net 213,103 174,242
Below-market ground leases    
Finite-Lived Intangible Assets, Net [Abstract]    
Deferred leasing costs and lease intangibles 72,916 68,388
Accumulated amortization (8,932) (6,498)
Deferred leasing costs and lease intangibles, net 63,984 61,890
Above-market leases    
Finite-Lived Intangible Assets, Net [Abstract]    
Deferred leasing costs and lease intangibles 8,425 18,028
Accumulated amortization (5,616) (15,131)
Deferred leasing costs and lease intangibles, net 2,809 2,897
Below-market leases    
Intangible Liability, Amortization Expense, Maturity Schedule [Line Items]    
Below-market leases, net 101,736 103,597
Above-market ground leases, net (57,043) (55,019)
Off-market leases, net 44,693 48,578
Above-market ground leases    
Intangible Liability, Amortization Expense, Maturity Schedule [Line Items]    
Below-market leases, net 1,095 1,095
Above-market ground leases, net (176) (133)
Off-market leases, net $ 919 $ 962