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Intangible Assets and Liabilities - Intangible Assets and Liabilities Summary (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross $ 737,518 $ 724,067
Less: accumulated amortization (233,513) (206,705)
Finite-lived intangible assets, net 504,005 517,362
Indefinite-Lived Intangible Assets    
Goodwill 304 304
Total intangible assets, gross 737,822 724,371
Total intangible assets, net 504,309 517,666
Finite-Lived Intangible Liabilities    
Finite-lived intangible liabilities, gross (83,118) (121,870)
Less: accumulated amortization 21,106 39,071
Finite-lived intangible liabilities, net (62,012) (82,799)
Below-market rent    
Finite-Lived Intangible Liabilities    
Finite-lived intangible liabilities, gross (81,973) (120,725)
Less: accumulated amortization 21,049 39,025
Finite-lived intangible liabilities, net $ (60,924) (81,700)
Below-market rent | Minimum    
Intangible Assets Liabilities    
Finite lived intangible asset/liability, useful life 7 years  
Below-market rent | Maximum    
Intangible Assets Liabilities    
Finite lived intangible asset/liability, useful life 53 years  
Above-market ground lease    
Finite-Lived Intangible Liabilities    
Finite-lived intangible liabilities, gross $ (1,145) (1,145)
Less: accumulated amortization 57 46
Finite-lived intangible liabilities, net $ (1,088) (1,099)
Above-market ground lease | Minimum    
Intangible Assets Liabilities    
Finite lived intangible asset/liability, useful life 49 years  
Above-market ground lease | Maximum    
Intangible Assets Liabilities    
Finite lived intangible asset/liability, useful life 88 years  
In-place lease    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross $ 627,385 620,149
Less: accumulated amortization (202,882) (181,598)
Finite-lived intangible assets, net $ 424,503 438,551
In-place lease | Minimum    
Intangible Assets Liabilities    
Finite lived intangible asset/liability, useful life 2 years  
In-place lease | Maximum    
Intangible Assets Liabilities    
Finite lived intangible asset/liability, useful life 53 years  
Above-market rent    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross $ 97,521 91,895
Less: accumulated amortization (29,969) (24,599)
Finite-lived intangible assets, net $ 67,552 67,296
Above-market rent | Minimum    
Intangible Assets Liabilities    
Finite lived intangible asset/liability, useful life 5 years  
Above-market rent | Maximum    
Intangible Assets Liabilities    
Finite lived intangible asset/liability, useful life 40 years  
Below-market ground leases    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross $ 12,612 12,023
Less: accumulated amortization (662) (508)
Finite-lived intangible assets, net $ 11,950 $ 11,515
Below-market ground leases | Minimum    
Intangible Assets Liabilities    
Finite lived intangible asset/liability, useful life 55 years  
Below-market ground leases | Maximum    
Intangible Assets Liabilities    
Finite lived intangible asset/liability, useful life 94 years