Amount of premium paid for combined directors' and officers' liability insurance policy.

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- Definition

The number of real estate properties under operating agreements.

+ References

No definition available.

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- Definition

Represents the service fee paid by a related party to RMR LLC, as a percentage of total annual earned premiums payable under the active policies issued or underwritten by the related party.

+ References

No definition available.

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(12))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(10))
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-Name Accounting Standards Codification
-Topic 230
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-Paragraph 28
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-Name Accounting Standards Codification
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-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13)(f))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Definition

Amount of increase (decrease) in other comprehensive income, after tax, from changes classified as other.

+ References

No definition available.

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- Definition

A contract to provide coverage or protection in exchange for a payment or "premium". Examples of insurance protection include liability and property insurance. The entity paying the premiums for the protection will have insurance expense and possibly an asset, Prepaid Insurance (if the premiums are paid in advance).

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Related Person Transactions - Sonesta and AIC (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($) hotel	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items]
Earnings (losses) recognized related to equity investments		$ 607		$ 137		$ 21
Sonesta International Hotels Corporation
Related Party Transaction [Line Items]
Number of real estate properties \| hotel		49
Affiliates Insurance Company
Related Party Transaction [Line Items]
Annual premium payable service fee		3.00%
Property insurance premium			$ 4,004		$ 4,099
Equity method investments, carrying value		$ 8,192		7,123		6,834
Earnings (losses) recognized related to equity investments		607		137		21
Other comprehensive income, other, net of tax		460		152		(20)
RMR LLC
Related Party Transaction [Line Items]
Premium paid for combined directors' and officers' liability insurance policy		$ 253		$ 141		$ 463
Forecast \| Affiliates Insurance Company
Related Party Transaction [Line Items]
Property insurance premium	$ 6,387