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Related Person Transactions - Investment in RMR Inc (Details) $ in Thousands	1 Months Ended	6 Months Ended
	Mar. 31, 2017 building	Jun. 30, 2018 USD ($) building agreement shares	Dec. 31, 2017 USD ($)
Related person transactions
Number of buildings included in joint venture agreement | building	2
RMR Inc | Class A common shares
Related person transactions
Number of management agreements | agreement		2
Equity securities investment (in shares) | shares		2,637,408
AIC
Related person transactions
Property insurance annual premium | $		$ 4,613
Equity method investments | $		$ 8,153	$ 8,185
MOBs
Related person transactions
Standalone insurance policy coverage period		1 year
Number of buildings included in joint venture agreement | building		2

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- Definition

This element represents the amount of annual premiums including taxes and fees for property insurance pursuant to an insurance program arranged by the equity method investee.

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Number of Buildings Included in Joint Venture Agreement

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

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