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Fair Value of Assets and Liabilities - Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Recurring Fair Value Measurements
Unrealized gains and losses on equity securities, net	$ 23,265	$ 0	$ 50,506	$ 0
Impairment of assets	$ 548	5,082	$ 548	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	$ 206,905		$ 206,905
Recurring | Five Star
Recurring Fair Value Measurements
Investments in affiliates, fair value	6,353		6,353
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | RMR Inc
Recurring Fair Value Measurements
Investments in affiliates, fair value	206,905		206,905
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Five Star
Recurring Fair Value Measurements
Investments in affiliates, fair value	6,353		6,353
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	$ 22,418		$ 50,506
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	$ 847		$ 0
Impairment of assets		$ 5,082		$ 5,082

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
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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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The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

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