Intangible Assets and Liabilities - Summary of Intangible Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Amortization recorded against rental income related to above and (below) market leases
Schedule of Finite-Lived Intangible Assets and Liabilities [Line Items]
Amortization of intangible assets and liabilities	$ (246)	$ (40)	$ (308)	$ (263)
Rental expense related to above and (below) market leasehold interests
Schedule of Finite-Lived Intangible Assets and Liabilities [Line Items]
Amortization of intangible assets and liabilities	286	166	563	295
Amortization expense related to in place leases and tenant relationships
Schedule of Finite-Lived Intangible Assets and Liabilities [Line Items]
Amortization of intangible assets and liabilities	$ 16,677	$ 14,457	$ 34,325	$ 27,187