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Related Person Transactions - Sonesta (Details) $ in Thousands | Mar. 31, 2017 USD ($) hotel shares | Dec. 31, 2016 USD ($)
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Travel Centers of America LLC |  |
Related Party Transaction [Line Items] |  |
Lessee as percentage of gross carrying value of real estate | 36.00% |
Shares included in investment securities (in shares) | shares | 3,420,000 |
Percentage of total shares outstanding | 8.70% |
AIC |  |
Related Party Transaction [Line Items] |  |
Carrying value of investments | $ | $ 7,373 | $ 7,123
Hotel |  |
Related Party Transaction [Line Items] |  |
Number of properties owned | hotel | 308 |
Sonesta agreements | Hotel | Sonesta Int'l Hotels Corp |  |
Related Party Transaction [Line Items] |  |
Number of properties owned | hotel | 34 |
Common Class A | RMR Inc |  |
Related Party Transaction [Line Items] |  |
Shares included in investment securities (in shares) | shares | 2,503,777 |

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