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Related Person Transactions - Investment in RMR Inc (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
RMR Inc | Class A common shares |  |
Related person transactions |  |
Number of shares purchased (in shares) | 2,637,408 |
AIC |  |
Related person transactions |  |
Equity method investments | $ 7,366,000 | $ 7,116,000

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