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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jun. 30, 2012	Dec. 31, 2011
CONDENSED CONSOLIDATED BALANCE SHEETS
Common shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares of beneficial interest, shares authorized	174,700,000	174,700,000
Common shares of beneficial interest, shares issued	162,675,108	162,646,046
Common shares of beneficial interest, shares outstanding	162,675,108	162,646,046

X

- Definition

Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

+ References

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



-Publisher FASB



-Name Statement of Financial Accounting Standard (FAS)



-Number 129



-Paragraph 4



-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.







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



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-Section S99



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-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 30



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X

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



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X

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section S99



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-Publisher AICPA



-Name Accounting Principles Board Opinion (APB)



-Number 12



-Paragraph 10



-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.







Reference 4: http://www.xbrl.org/2003/role/presentationRef



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