Commitments and Contingencies (Narrative) (Details) (USD $)	9 Months Ended
Sep. 30, 2012
Commitments and Contingencies Disclosure [Abstract]
Aggregate face amount of letters of credit pledged	$ 3,700,000
Investment in development or redevelopment projects	148,900,000
Additional investment required to complete the project	114,400,000
Litigation settlement	$ 525,000

The current amount of expenditures for a real estate project that has not yet been completed.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.10)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Name:	us-gaap_DevelopmentInProcess
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant