Properties, net (Details 2) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Properties
Properties under construction or development	$ 696,914	$ 642,682
Projects under construction or development \| Land, development
Properties
Properties under construction or development	248,945	256,487
Projects under construction or development \| Construction in progress, excluding land
Properties
Properties under construction or development	$ 447,969	$ 386,195

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