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Shareholders' Equity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended				3 Months Ended
	Mar. 31, 2012	Feb. 29, 2012	May 31, 2011	Feb. 28, 2011	Mar. 31, 2012	Mar. 31, 2011	Apr. 03, 2012
Distributions
Distribution to common shareholders (in dollars per share)		$ 0.38	$ 0.37	$ 0.37
Distribution to common shareholders		$ 61,806	$ 52,490	$ 52,486	$ 61,806	$ 52,486
Distribution declared to common shareholders (in dollars per share)							$ 0.38
Distribution declared to common shareholders							61,813
Common shares issued to RMR	20,462
Payment of an incentive fee to RMR	$ 453

X

- Definition

Represents the incentive fee incurred pursuant to business and property management agreements with RMR.

+ References

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Aggregate dividends paid during the period for each share of common stock outstanding.

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-Publisher SEC

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The aggregate amount of dividends declared, but not paid, as of the financial reporting date.

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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