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Deferred Leasing Costs and Lease Intangibles, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets, Net [Abstract]    
Deferred leasing costs and lease intangibles, net $ 244,554 $ 288,929
Intangible Liability, Amortization Expense, Maturity Schedule [Line Items]    
Off-market leases, net 49,930 73,267
Above-market leases    
Finite-Lived Intangible Assets, Net [Abstract]    
Deferred leasing costs and lease intangibles 19,222 23,075
Accumulated amortization (15,731) (12,645)
Deferred leasing costs and lease intangibles, net 3,491 10,430
Deferred leasing costs and in-place lease intangibles    
Finite-Lived Intangible Assets, Net [Abstract]    
Deferred leasing costs and lease intangibles 311,599 343,807
Accumulated amortization (132,426) (129,830)
Deferred leasing costs and lease intangibles, net 179,173 213,977
Below-market ground leases    
Finite-Lived Intangible Assets, Net [Abstract]    
Deferred leasing costs and lease intangibles 68,388 68,601
Accumulated amortization (6,498) (4,079)
Deferred leasing costs and lease intangibles, net 61,890 64,522
Below-market leases    
Intangible Liability, Amortization Expense, Maturity Schedule [Line Items]    
Below-market leases, net 105,233 127,950
Above-market ground leases, net (56,265) (55,689)
Off-market leases, net 48,968 72,261
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 (133) (89)
Off-market leases, net $ 962 $ 1,006