Real Estate Intangibles (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Real Estate Intangible Amortization [Abstract]
Rental income related to above/below market tenant leases, net	$ 267	$ 210	$ 571	$ 290
Property operating expenses related to above/below market ground leases, net	(307)	(311)	(619)	(622)
Depreciation and amortization related to in place lease intangibles and lease commissions	$ (35,439)	$ (31,109)	$ (74,741)	$ (65,473)