Real Estate Intangibles (Details 1) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Real Estate Intangible Amortization [Abstract]
Rental income related to above/below market tenant leases, net	$ 290,000	$ 213,000	$ 245,000	$ 361,000
Property operating expenses related to above/below market ground leases, net	(299,000)	(303,000)	(610,000)	(606,000)
Depreciation and amortization related to in place lease intangibles and lease commissions	$ 59,603,000	$ (39,083,000)	$ 138,998,000	$ (89,659,000)