Investments in Partnerships Partnership Acquisitions and Dispositions (Details) (Gloucester Premium Outlets [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
Jun. 30, 2014	Sep. 30, 2014
Gloucester Premium Outlets [Member]
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage		25.00%
Partners' Capital Account, Contributions	$ 3.2

Total contributions made by each class of partners (i.e., general, limited and preferred partners).

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

Name:	us-gaap_PartnersCapitalAccountContributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration