Real Estate Intangibles (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Real Estate Intangible Amortization [Abstract]
Rental income related to above/below market tenant leases, net	$ 173	$ 278	$ 745	$ 569
Property operating expenses related to above/below market ground leases, net	(306)	(309)	(925)	(931)
Depreciation and amortization related to in place lease intangibles and lease commissions	$ (34,270)	$ (30,137)	$ (109,011)	$ (95,610)