Acquired Intangible Assets And Liabilities (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Amortization of below market leases	$ 2,800,000	$ 3,000,000
Expected average remaining lives of acquired below market leases	6 years 6 months
Amortization of intangible assets	19,478,000	18,338,000
Acquired Above-Market Lease Value [Member]
Finite-Lived Intangible Assets [Line Items]
Expected average remaining lives	4 years 3 months 18 days
Acquired-In Place Lease Value [Member]
Finite-Lived Intangible Assets [Line Items]
Expected average remaining lives	6 years 4 months 24 days
Amortization of intangible assets	$ 15,100,000	$ 14,900,000
Weighted average remaining contractual life for acquired leases excluding renewals or extensions	5 years