Acquired Intangible Assets And Liabilities (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Amortization of below market leases	$ 11,700,000	$ 10,300,000
Expected average remaining lives of acquired below market leases	6 years 6 months
Amortization of intangible assets	77,872,000	66,489,000	63,401,000
Acquired Above-Market Lease Value [Member]
Finite-Lived Intangible Assets [Line Items]
Expected average remaining lives	4 years 6 months
Acquired In Place Lease Value [Member]
Finite-Lived Intangible Assets [Line Items]
Expected average remaining lives	6 years 7 months 6 days
Amortization of intangible assets	$ 62,700,000	$ 54,000,000
Weighted average remaining contractual life for acquired leases excluding renewals or extensions	5 years 1 month 6 days