Interest and Other Income, net (Details) (Tenant Utility Costs [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
Jun. 30, 2011
Tenant Utility Costs [Member]
Interest and Other Income [Line Items]
Interest and Other Income, Net	$ 1,657

Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

-Section 04

-Paragraph 4

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.4)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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