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Consolidated Statements of Beneficiaries' Equity (Unaudited) (Parenthetical) (USD $) | 9 Months Ended
--- | ---
Sep. 30, 2011 | Sep. 30, 2010
Distributions declared, per share | $ 0.45 | $ 0.45
Cumulative Distributions |  |
Distributions declared, per share | $ 0.45 | $ 0.45
Non-Controlling Interests |  |
Distributions declared, per share | $ 0.45 | $ 0.45

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References 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 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration