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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended			6 Months Ended
	May. 21, 2015	Apr. 24, 2015	Feb. 24, 2015	Jun. 30, 2015	Feb. 28, 2015	Apr. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Distributions
Distribution to common shareholders (in dollars per share)	$ 0.39	$ 0.39	$ 0.39
Distribution to common shareholders	$ (91,655)	$ 92,585	$ 79,530				$ 171,185	$ 146,783
Common shares issued in public offering					31,050,000	15,525,000
Net proceeds after underwriting discounts from issuance of common shares issued in public offering					$ 659,502	$ 322,807	$ 659,502	$ 322,864
RMR LLC
Distributions
Shares issued in connection with acquisition							81,557
RMR LLC
Distributions
Shares issued in connection with acquisition				2,345,000

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Number of shares of equity interests issued or issuable to acquire entity.

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