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Related Person Transactions - Investment in RMR Inc (Details) $ in Thousands	Mar. 31, 2018 USD ($) agreement shares	Dec. 31, 2017 USD ($)
RMR Inc | Class A common shares
Related person transactions
Number of management agreements | agreement	2
Equity securities investment (in shares)	2,637,408
Five Star
Related person transactions
Equity securities investment (in shares)	4,235,000
AIC
Related person transactions
Equity method investments | $	$ 8,136	$ 8,185

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Number of Management Agreements

+ References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570

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-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
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-Subparagraph (SX 210.12-12C.Column B)
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
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