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Deferred Leasing Costs and Lease Intangibles, net - Schedule of Finite-Lived Intangible Assets and Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Finite-Lived Intangible Assets, Net [Abstract]          
Deferred leasing costs and lease intangibles, net $ 256,100   $ 256,100   $ 239,029
Other Liabilities, Unclassified [Abstract]          
Below and above market ground leases, net 43,289   43,289   49,540
Amortization of above- and below-market leases, net     (10,271) $ (14,326)  
Below-Market Leases          
Other Liabilities, Unclassified [Abstract]          
Below and above market ground leases 95,533   95,533   103,597
Below and above market ground leases, accumulated amortization (53,173)   (53,173)   (55,019)
Below and above market ground leases, net 42,360   42,360   48,578
Amortization of above- and below-market leases, net 3,584 $ 5,776 11,509 19,448  
Above-Market Ground Leases          
Other Liabilities, Unclassified [Abstract]          
Below and above market ground leases 1,095   1,095   1,095
Below and above market ground leases, accumulated amortization (166)   (166)   (133)
Below and above market ground leases, net 929   929   962
Amortization of above- and below-market leases, net 11 11 33 33  
Above-market leases          
Finite-Lived Intangible Assets, Net [Abstract]          
Deferred leasing costs and lease intangibles 9,600   9,600   18,028
Accumulated amortization (7,222)   (7,222)   (15,131)
Deferred leasing costs and lease intangibles, net 2,378   2,378   2,897
Other Liabilities, Unclassified [Abstract]          
Amortization of above- and below-market leases, net (355) (1,855) (1,238) (5,122)  
Deferred leasing costs and in-place lease intangibles          
Finite-Lived Intangible Assets, Net [Abstract]          
Deferred leasing costs and lease intangibles 315,232   315,232   301,945
Accumulated amortization (121,592)   (121,592)   (127,703)
Deferred leasing costs and lease intangibles, net 193,640   193,640   174,242
Other Liabilities, Unclassified [Abstract]          
Amortization of above- and below-market leases, net (11,038) (17,376) (34,157) (57,813)  
Below-market ground leases          
Finite-Lived Intangible Assets, Net [Abstract]          
Deferred leasing costs and lease intangibles 68,388   68,388   68,388
Accumulated amortization (8,306)   (8,306)   (6,498)
Deferred leasing costs and lease intangibles, net 60,082   60,082   $ 61,890
Other Liabilities, Unclassified [Abstract]          
Amortization of above- and below-market leases, net $ (602) $ (629) $ (1,840) $ (2,121)