Acquired Intangible Assets And Liabilities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization of below market leases	$ 2,200	$ 2,400	$ 6,900	$ 7,700
Expected average remaining lives of acquired below market leases			2052 days
Amortization of intangible assets			$ 51,112	64,541
Acquired Above-Market Lease Value
Finite-Lived Intangible Assets [Line Items]
Expected average remaining lives			1223 days
Acquired-In Place Lease Value
Finite-Lived Intangible Assets [Line Items]
Expected average remaining lives			2179 days
Amortization of intangible assets	$ 10,100	$ 16,500	$ 32,200	$ 50,000
Weighted average remaining contractual life for acquired leases excluding renewals or extensions			1683 days