Real Estate Intangibles (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Real Estate Intangible Amortization [Abstract]
Rental income related to above/below market tenant leases, net	$ (294)	$ 173	$ (978)	$ 745
Property operating expenses related to above/below market ground leases, net	(327)	(306)	(1,006)	(925)
Depreciation and amortization related to in place lease intangibles and lease commissions	$ (31,455)	$ (34,270)	$ (97,479)	$ (109,011)