Real Estate - In-Place Lease Valuation and Tenant Origination and Absorption Costs (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Above Market Lease [Abstract]
In-place lease valuation (above market)	$ 4,046	$ 4,046
In-place lease valuation (above market), accumulated amortization	(1,215)	(1,123)
Intangible assets, net	2,831	2,923
Below Market Lease, Net [Abstract]
In-place lease valuation (below market)	(62,070)	(62,070)
In-place lease valuation (below market) - accumulated amortization	17,091	15,841
In-place lease valuation (below market), net	(44,979)	(46,229)
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	(77,331)	(71,364)
Tenant origination and absorption cost, net	$ 163,033	$ 169,000