Real Estate Intangibles (Details 1) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Real Estate Intangible Amortization [Abstract]
Rental income related to above/below market tenant leases, net	$ (1,684,000)	$ 179,000	$ (1,901,000)	$ 423,000
Property operating expenses related to above/below market ground leases, net	(308,000)	(317,000)	(962,000)	(926,000)
Depreciation and amortization related to in place lease intangibles and lease commissions	$ (26,137,000)	$ (46,366,000)	$ (82,434,000)	$ (185,363,000)