Fair Value of Assets and Liabilities (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) shares
Travel Centers of America LLC
Fair Value of Assets and Liabilities
Shares included in investment securities (in shares) \| shares	3,420,000
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
Travel Centers of America LLC
Fair Value of Assets and Liabilities
Unrealized gain (loss) on securities included in cumulative other comprehensive income	$ (3,385)
Travel Centers of America LLC \| Quoted prices in active markets for identical assets (Level 1)
Fair Value of Assets and Liabilities
Shares included in investment securities (in shares) \| shares	3,420,000
Historical cost of securities	$ 17,407
Travel Centers of America LLC \| Recurring \| Quoted prices in active markets for identical assets (Level 1)
Fair Value of Assets and Liabilities
Investment securities	14,022
Travel Centers of America LLC \| Recurring \| Significant Other Observable Inputs (Level 2)
Fair Value of Assets and Liabilities
Investment securities	0
Travel Centers of America LLC \| Recurring \| Significant Unobservable Inputs (Level 3)
Fair Value of Assets and Liabilities
Investment securities	0
Travel Centers of America LLC \| Carrying Amount \| Recurring
Fair Value of Assets and Liabilities
Investment securities	14,022
RMR Inc
Fair Value of Assets and Liabilities
Unrealized gain (loss) on securities included in cumulative other comprehensive income	$ 82,100
RMR Inc \| Quoted prices in active markets for identical assets (Level 1)
Fair Value of Assets and Liabilities
Shares included in investment securities (in shares) \| shares	2,503,777
Historical cost of securities	$ 66,374
RMR Inc \| Recurring \| Quoted prices in active markets for identical assets (Level 1)
Fair Value of Assets and Liabilities
Investment securities	148,474
RMR Inc \| Recurring \| Significant Other Observable Inputs (Level 2)
Fair Value of Assets and Liabilities
Investment securities	0
RMR Inc \| Recurring \| Significant Unobservable Inputs (Level 3)
Fair Value of Assets and Liabilities
Investment securities	0
RMR Inc \| Carrying Amount \| Recurring
Fair Value of Assets and Liabilities
Investment securities	$ 148,474

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Cost of the investment.

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Amount of unrealized gain (loss) recognized in the income statement on unsold other securities.

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