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Fair Value of Assets and Liabilities - Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Recurring Fair Value Measurements
Unrealized gains and losses on equity securities, net	$ 35,137	$ 0	$ 85,643	$ 0
Impairment of assets	$ 4,525	$ 0	$ 5,073	5,082
Five Star
Recurring Fair Value Measurements
Equity securities investment (in shares)	4,235,000		4,235,000
Recurring | RMR Inc
Recurring Fair Value Measurements
Investments in affiliates, fair value	$ 244,751		$ 244,751
Recurring | Five Star
Recurring Fair Value Measurements
Investments in affiliates, fair value	3,643		3,643
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | RMR Inc
Recurring Fair Value Measurements
Investments in affiliates, fair value	244,751		244,751
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Five Star
Recurring Fair Value Measurements
Investments in affiliates, fair value	3,643		3,643
Recurring | Significant Other Observable Inputs (Level 2) | RMR Inc
Recurring Fair Value Measurements
Investments in affiliates, fair value	0		0
Recurring | Significant Other Observable Inputs (Level 2) | Five Star
Recurring Fair Value Measurements
Investments in affiliates, fair value	0		0
Recurring | Significant Unobservable Inputs (Level 3) | RMR Inc
Recurring Fair Value Measurements
Investments in affiliates, fair value	0		0
Recurring | Significant Unobservable Inputs (Level 3) | Five Star
Recurring Fair Value Measurements
Investments in affiliates, fair value	$ 0		$ 0
Class A common shares | RMR Inc
Recurring Fair Value Measurements
Equity securities investment (in shares)	2,637,408		2,637,408
Investment, original cost	$ 69,826		$ 69,826
Unrealized gains and losses on equity securities, net	$ 37,847		$ 88,353
Common Shares | Five Star
Recurring Fair Value Measurements
Equity securities investment (in shares)	4,235,000		4,235,000
Investment, original cost	$ 6,353		$ 6,353
Unrealized gains and losses on equity securities, net	$ (2,710)		$ (2,710)
Impairment of assets				$ 5,082

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Original amount of cost-method investments at the acquisition date.

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Balance held at close of period in number of shares.

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Amount of unrealized gain (loss) on investment in marketable security.

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