Real Estate Intangibles (Details 1) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Real Estate Intangible Amortization [Abstract]
Rental income related to above/below market tenant leases, net	$ 206,000	$ (45,000)
Property operating expenses related to above/below market ground leases, net	(319,000)	(311,000)
Depreciation and amortization related to in place lease intangibles and lease commissions	$ 24,324,000	$ (79,393,000)