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Equity Incentive Plan - Additional Information (Details) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Mar. 01, 2018 $ / shares shares | Mar. 01, 2017 shares | Jan. 28, 2016 shares | Jun. 01, 2015 shares | May 17, 2013 shares | Jan. 31, 2018 shares | Jan. 31, 2017 shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common shares available for issuance (in shares) |  |  |  |  |  |  |  | 1,405,529 |  | 1,405,529 |  |
Independent Trustees |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common share issued as compensation for services performed (in shares) |  |  |  |  |  | 21,670 | 23,980 |  |  |  |  |
Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  | 3,000,000 |  |  |  |  |  |  |
Vesting period for share awards under equity |  |  |  |  | 3 years |  |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs | $ |  |  |  |  |  |  |  | $ 43,100 |  | $ 43,100 |  | $ 100,000
Weighted-average period for recognition of unrecognized compensation costs |  |  |  |  |  |  |  |  |  | 1 year 3 months 19 days |  |
Compensation expense, recognized | $ |  |  |  |  |  |  |  | 8,400 | $ 200,000 | $ 100,000 | $ 400,000 |
Number of shares, Granted (in shares) |  |  |  |  |  |  |  |  |  | 0 |  | 5,000
Long Term Incentive Plan Units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average period for recognition of unrecognized compensation costs |  |  |  |  |  |  |  |  |  | 1 year 11 months 13 days |  |
Compensation expense, recognized | $ |  |  |  |  |  |  |  | 900,000 | $ 700,000 | $ 2,700,000 | $ 1,800,000 |
Exchange ratio |  |  |  |  |  |  |  |  |  | 1 |  |
Number of shares, Granted (in shares) |  |  |  |  |  |  |  |  |  | 244,917 |  | 223,922
Total unrecognized compensation cost related to LTIP Units | $ |  |  |  |  |  |  |  | $ 5,900,000 |  | $ 5,900,000 |  | $ 4,400,000
Long Term Incentive Plan Units | Awarded June 1, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average period for recognition of unrecognized compensation costs |  |  |  |  |  |  |  |  |  | 2 years |  |
Number of shares, Granted (in shares) |  |  |  | 183,300 |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Time-Based |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, Granted (in shares) | 97,968 | 89,574 | 72,966 |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Time-Based | Awards March 1, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, Granted (in shares) | 97,968 |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Performance-Based |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, Granted (in shares) | 146,949 | 134,348 | 39,285 |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Performance-Based | Awards March 1, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vesting period for share awards under equity | 3 years |  |  |  |  |  |  |  |  |  |  |
Number of shares, Granted (in shares) | 146,949 |  |  |  |  |  |  |  |  |  |  |
Grants in period, intrinsic value, amount per share (in dollars per share) | $ / shares | $ 17.02 |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Performance-Based | Awards March 1, 2018 | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of units paid out | 50.00% |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Performance-Based | Awards March 1, 2018 | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of units paid out | 150.00% |  |  |  |  |  |  |  |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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