Commitments And Contingencies (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended			12 Months Ended						12 Months Ended
	Nov. 30, 2012 jvs	Dec. 31, 2012 partnerships	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2012 Capital Additions [Member]	Dec. 31, 2012 Capital Additions [Member] Minimum [Member]	Dec. 31, 2012 Capital Additions [Member] Maximum [Member]	Dec. 31, 2012 Shopping Centers [Member] property	Dec. 31, 2012 Noncontrolling Interests [Member]	Dec. 31, 2011 Noncontrolling Interests [Member]	Dec. 31, 2010 Noncontrolling Interests [Member]	Dec. 31, 2012 Consoldiated Real Estate Joint Ventures [Member] jvs	Dec. 31, 2012 Unconsolidated Real Estate Joint Ventures [Member] jvs
Long-term Purchase Commitment [Line Items]
Ground leases, expiration date		Jun. 30, 2069
Operating lease agreement, term range, in years					1 year	25 years
Number of real estate properties										2
Number of DownREITS		4
Shares issued in exchange for noncontrolling interests			$ 0								$ 0	$ 0	$ 746,000
Aggregate redemption value of interests		42,000,000		35,000,000
Number of real estate joint ventures	3													1	2
Construction contract commitment							$ 58,300,000
Construction contract period, months								12	36