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Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Goodwill $ 1,674 $ 1,674
Total intangible assets 155,025 186,206
In-place Leases    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, net 113,542 139,548
Accumulated amortization 117,553 91,548
Above-market Tenant Leases    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, net 21,948 26,917
Accumulated amortization 18,007 13,038
Below-market Ground Lease    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, net 17,861 18,067
Accumulated amortization $ 552 $ 345