Real Estate - In-Place Lease Valuation and Tenant Origination and Absorption Costs (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Above Market Lease [Abstract]
In-place lease valuation (above market)	$ 4,046	$ 4,046
In-place lease valuation (above market), accumulated amortization	(844)	(752)
Intangible assets, net	3,202	3,294
Below Market Lease, Net [Abstract]
In-place lease valuation (below market)	(62,070)	(62,070)
In-place lease valuation (below market) - accumulated amortization	12,024	10,775
In-place lease valuation (below market), net	(50,046)	(51,295)
Tenant Origination and Absorption Cost
Finite-Lived Intangible Assets, Net [Abstract]
Tenant origination and absorption cost	240,364	240,364
Tenant origination and absorption cost - accumulated amortization	(53,132)	(47,165)
Tenant origination and absorption cost, net	$ 187,232	$ 193,199