The carrying amount of the liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph a

-URI http://asc.fasb.org/extlink&oid=6970148&loc=d3e5728-111685

Name:	us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Variable Interest Entities (Narrative) (Details) (USD $) In Millions, unless otherwise specified		3 Months Ended							12 Months Ended
	Mar. 31, 2012 Unconsolidated Variable Interest Entities [Member]	Mar. 31, 2012 Consolidated Variable Interest Entities [Member]	Mar. 31, 2012 Texas [Member] Consolidated Variable Interest Entities [Member]	Mar. 31, 2012 Georgia [Member] Consolidated Variable Interest Entities [Member]	Mar. 31, 2012 Tennessee [Member] Consolidated Variable Interest Entities [Member]	Mar. 31, 2012 Florida [Member] Consolidated Variable Interest Entities [Member]	Mar. 31, 2012 North Carolina [Member] Consolidated Variable Interest Entities [Member]	Mar. 31, 2012 Through Secured Loans [Member] Unconsolidated Variable Interest Entities [Member]	Dec. 31, 2011 Through Guaranty On Debt [Member] Unconsolidated Variable Interest Entities [Member]
Variable Interest Entity [Line Items]
Number of VIE real estate joint ventures		2						2	1
Number of neighborhood/community shopping centers		30	22	3	2	2	1
Debt associated with tenancy-in-common arrangement	$ 21.3