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Fair Value of Assets and Liabilities - Recurring and Non-Recurring (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value of Assets and Liabilities
Unrealized gains and losses on equity securities, net	$ 24,955	$ 0
Travel Centers of America LLC
Fair Value of Assets and Liabilities
Unrealized gains and losses on equity securities, net	(1,710)
RMR Inc
Fair Value of Assets and Liabilities
Unrealized gains and losses on equity securities, net	$ 26,665
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)	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)	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	12,312
Recurring \| Quoted prices in active markets for identical assets (Level 1) \| RMR Inc
Fair Value of Assets and Liabilities
Investment securities	175,139
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	12,312
Carrying amount \| Recurring \| RMR Inc
Fair Value of Assets and Liabilities
Investment securities	$ 175,139