Acquired Intangible Assets And Liabilities (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization of below market leases	$ 2,300,000	$ 2,800,000
Expected average remaining lives of acquired below market leases	2201 days
Amortization of intangible assets	17,379,000	19,478,000
Acquired Above-Market Lease Value
Finite-Lived Intangible Assets [Line Items]
Expected average remaining lives	1345 days
Acquired-In Place Lease Value
Finite-Lived Intangible Assets [Line Items]
Expected average remaining lives	2152 days
Amortization of intangible assets	$ 11,600,000	$ 15,100,000
Weighted average remaining contractual life for acquired leases excluding renewals or extensions	1694 days