Real Estate Intangibles (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Real Estate Intangible Amortization [Abstract]
Rental income related to above/below market tenant leases, net	$ (351)	$ 304
Property operating expenses related to above/below market ground leases, net	367	(312)
Depreciation and amortization related to in place lease intangibles and lease commissions	$ (32,261)	$ (39,302)