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Fair Value of Assets and Liabilities - Recurring and Non-Recurring (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 USD ($) shares
Travel Centers of America LLC |
Fair Value of Assets and Liabilities |
Unrealized gain (loss) on securities included in cumulative other comprehensive income | $ (2,872)
RMR Inc |
Fair Value of Assets and Liabilities |
Unrealized gain (loss) on securities included in cumulative other comprehensive income | $ 62,195
Quoted prices in active markets for identical assets (Level 1) | Travel Centers of America LLC |
Fair Value of Assets and Liabilities |
Shares included in investment securities (in shares) | shares | 3,420,000
Historical cost of securities | $ 17,407
Quoted prices in active markets for identical assets (Level 1) | RMR Inc |
Fair Value of Assets and Liabilities |
Shares included in investment securities (in shares) | shares | 2,503,777
Historical cost of securities | $ 66,374
Recurring | Quoted prices in active markets for identical assets (Level 1) | Travel Centers of America LLC |
Fair Value of Assets and Liabilities |
Investment securities | 14,535
Recurring | Quoted prices in active markets for identical assets (Level 1) | RMR Inc |
Fair Value of Assets and Liabilities |
Investment securities | 128,569
Recurring | Significant other observable inputs (Level 2) | Travel Centers of America LLC |
Fair Value of Assets and Liabilities |
Investment securities | 0
Recurring | Significant other observable inputs (Level 2) | RMR Inc |
Fair Value of Assets and Liabilities |
Investment securities | 0
Recurring | Significant unobservable inputs (Level 3) | Travel Centers of America LLC |
Fair Value of Assets and Liabilities |
Investment securities | 0
Recurring | Significant unobservable inputs (Level 3) | RMR Inc |
Fair Value of Assets and Liabilities |
Investment securities | 0
Carrying amount | Recurring | Travel Centers of America LLC |
Fair Value of Assets and Liabilities |
Investment securities | 14,535
Carrying amount | Recurring | RMR Inc |
Fair Value of Assets and Liabilities |
Investment securities | $ 128,569

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