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Intangible Assets and Liabilities - Intangible Assets and Liabilities Summary (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross $ 728,874 $ 724,067
Less: accumulated amortization (220,781) (206,705)
Finite-lived intangible assets, net 508,093 517,362
Indefinite-Lived Intangible Assets    
Goodwill 304 304
Total intangible assets, gross 729,178 724,371
Total intangible assets, net 508,397 517,666
Finite-Lived Intangible Liabilities    
Finite-lived intangible liabilities, gross (103,195) (121,870)
Less: accumulated amortization 40,295 39,071
Finite-lived intangible liabilities, net (62,900) (82,799)
Below-market rent    
Finite-Lived Intangible Liabilities    
Finite-lived intangible liabilities, gross (102,050) (120,725)
Less: accumulated amortization 40,246 39,025
Finite-lived intangible liabilities, net $ (61,804) (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 49 46
Finite-lived intangible liabilities, net $ (1,096) (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 and tenant relationship    
Finite-Lived Intangible Assets    
Finite-lived intangible assets, gross $ 624,201 620,149
Less: accumulated amortization (194,212) (181,598)
Finite-lived intangible assets, net $ 429,989 438,551
In-place lease and tenant relationship | Minimum    
Intangible Assets Liabilities    
Finite lived intangible asset/liability, useful life 1 year  
In-place lease and tenant relationship | 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 $ 92,580 91,895
Less: accumulated amortization (26,013) (24,599)
Finite-lived intangible assets, net $ 66,567 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 $ 12,093 12,023
Less: accumulated amortization (556) (508)
Finite-lived intangible assets, net $ 11,537 $ 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