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Shareholders' Equity - Share Award Plans (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 14, 2015 | Sep. 30, 2015 | May. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jan. 11, 2016
Share award plans |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | $ 1,373,000 | $ 1,914,000 | $ 1,961,000 |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Dividends paid in kind | $ 0.1320 |  |  |  |  |  |
Scheduled to vest unvested shares |  |  |  |  |  |  |
Distribution declared to common shareholders (in dollars per share) |  |  |  |  |  |  | $ 0.39
Distribution declared to common shareholders |  |  |  |  |  |  | $ 92,614,000
Share Award Plans |  |  |  |  |  |  |
Share award plans |  |  |  |  |  |  |
Remaining common shares available for issuance |  |  |  | 2,640,536 |  |  |
Number of Shares |  |  |  |  |  |  |
Unvested shares at the beginning of the year |  |  |  | 153,478 | 150,711 | 140,034 |
Shares granted |  |  |  | 99,000 | 94,200 | 92,600 |
Shares vested |  |  |  | (93,604) | (91,433) | (81,923) |
Unvested shares at the end of the year |  |  |  | 158,874 | 153,478 | 150,711 |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |
Unvested shares at the beginning of the year (in dollars per share) |  |  |  | $ 23.39 | $ 23.84 | $ 23.03 |
Shares granted (in dollars per share) |  |  |  | 16.30 | 21.83 | 23.48 |
Shares vested (in dollars per share) |  |  |  | 16.17 | 21.87 | 23.85 |
Unvested shares at the end of the year (in dollars per share) |  |  |  | $ 19.39 | $ 23.39 | $ 23.84 |
Scheduled to vest unvested shares |  |  |  |  |  |  |
2016 |  |  |  | 61,644 |  |  |
2017 |  |  |  | 47,730 |  |  |
2018 |  |  |  | 32,700 |  |  |
2019 |  |  |  | 16,800 |  |  |
Estimated future compensation for the unvested shares |  |  |  | $ 2,358,000 |  |  |
Closing share price (in dollars per share) |  |  |  | $ 14.84 |  |  |
Weighted average period over which the compensation expense will be recorded |  |  |  | 1 year 8 months 12 days |  |  |
Share Award Plans | Trustees |  |  |  |  |  |  |
Share award plans |  |  |  |  |  |  |
Common shares awarded |  | 2,500 | 2,500 |  | 2,500 | 2,000 |
Aggregate market value of shares awarded |  | $ 41 |  |  | $ 306,000 | $ 286,000 |
Market value of shares awarded to each Trustee |  |  |  |  | $ 61,000 | $ 57,000 |
Share Award Plans | RMR LLC | Officers and Employees |  |  |  |  |  |  |
Share award plans |  |  |  |  |  |  |
Common shares awarded |  |  |  | 84,000 | 81,700 | 82,600 |
Aggregate market value of shares awarded |  |  | $ 252,000 | $ 1,321,000 | $ 1,750,000 | $ 1,888,000 |
Market value of shares awarded to each Trustee |  |  | $ 50,000 |  |  |  |
Award vesting period |  |  |  | 5 years |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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