Real Estate Acquisitions (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Liabilities Incurred	$ 183,500,000	$ 90,300,000
Business Acquisition, Cost of Acquired Entities, Fair Value of Debt Assumed	189,006,000	93,808,000
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Number of Properties Acquired During Period	48
Number of Non-Grocery Anchored Properties Acquired During Period	1
Business acquisition, cost of acquired entity, purchase price	770,900,000
Business Combination, Consideration Transferred, Liabilities Incurred	183,500,000
Business Acquisition, Cost of Acquired Entities, Fair Value of Debt Assumed	189,000,000
Business Acquisition, Cost of Acquired Entities, Value of Interest Rate Swap Assumed	$ 700,000
Leases, Acquired-in-Place, Acquired During Current Year [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life (in years)	7 years
Leases, Above-Market, Acquired During Current Year [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life (in years)	10 years
Leases, Below-Market, Acquired During Current Year [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life (in years)	11 years