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Related Person Transactions - Narrative (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 19, 2017 shares | Sep. 30, 2017 USD ($) hotel shares | Sep. 30, 2016 shares | Jun. 30, 2018 USD ($) | Dec. 31, 2016 USD ($)
Travel Centers of America LLC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Lessee as percentage of gross carrying value of real estate |  | 35.00% |  |  |
Shares included in investment securities (in shares) |  | 3,420,000 |  |  |
Percentage of total shares outstanding |  | 8.60% |  |  |
AIC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Carrying value of investments | $ |  | $ 7,952 |  |  | $ 7,123
Hotel |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of properties owned | hotel |  | 323 |  |  |
Sonesta agreements | Hotel | Sonesta Int'l Hotels Corp |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of properties owned | hotel |  | 49 |  |  |
Common Class A | RMR Inc |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Shares included in investment securities (in shares) |  | 2,503,777 |  |  |
Forecast | AIC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Real estate insurance | $ |  |  |  | $ 6,352 |
Officers and other employees | Common Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Shares granted in period (in shares) |  | 85,000 | 79,100 |  |
Shares repurchased (in shares) | 18,559 | 18,559 | 19,677 |  |

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