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Equity Incentive Plan - Additional Information (Details) $ / shares in Units, $ in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2020 $ / shares shares | Jan. 15, 2020 shares | Jun. 01, 2015 shares | May 17, 2013 shares | Jan. 31, 2020 shares | Jan. 31, 2019 shares | Jan. 31, 2018 shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares
Independent Trustees |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Trustee fees | $ |  |  |  |  |  |  |  | $ 0.1 | $ 0.1 | $ 0.1
Common shares issued as compensation for services performed (in shares) |  | 40,203 |  |  | 24,516 | 27,870 | 21,670 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Trustee fees paid in shares (up to 100%) (at least 50%) (in percentage) |  |  |  |  |  |  |  | 50.00% |  |
Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Trustee fees paid in shares (up to 100%) (at least 50%) (in percentage) |  |  |  |  |  |  |  | 100.00% |  |
Equity Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  | 3,000,000 |  |  |  |  |  |
Equity Incentive Plan | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period for share awards under equity |  |  |  | 3 years |  |  |  |  |  |
Equity Incentive Plan | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period for share awards under equity |  |  |  | 5 years |  |  |  |  |  |
2010 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common shares available for issuance (in shares) |  |  |  |  |  |  |  | 944,048 |  |
Number of trading days preceding the reporting date for which average of closing price of common shares is taken |  |  |  |  |  |  |  | 10 days |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs | $ |  |  |  |  |  |  |  | $ 0.0 | 0.1 |
Weighted - average period for recognition of unrecognized compensation costs |  |  |  |  |  |  |  | 1 year |  |
Compensation expense recognized | $ |  |  |  |  |  |  |  | $ 0.0 | $ 0.1 | $ 0.1
Shares granted (in shares) |  |  |  |  |  |  |  | 0 | 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 9 months 18 days |  |
Compensation expense recognized | $ |  |  |  |  |  |  |  | $ 4.4 | $ 4.2 | $ 3.6
Exchange ratio |  |  |  |  |  |  |  | 1 |  |
Shares granted (in shares) |  |  | 183,300 |  |  |  |  | 325,507 | 221,853 | 244,917
Total unrecognized compensation cost related to LTIP Units | $ |  |  |  |  |  |  |  | $ 4.9 | $ 4.9 |
Long Term Incentive Plan Units | Awarded June 1, 2015 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  | 183,300 |  |  |  |  |  |  |
2018 Time-Based LTIP Unit Award |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) | 130,206 |  |  |  |  |  |  |  |  |
2018 Performance-Based LTIP Unit Awards |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) | 195,301 |  |  |  |  |  |  |  |  |
Grants in period, intrinsic value, amount (in dollars per share) | $ / shares | $ 13.66 |  |  |  |  |  |  |  |  |
2018 Performance-Based LTIP Unit Awards | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of target value to be paid out |  |  |  |  |  |  |  | 50.00% |  |
2018 Performance-Based LTIP Unit Awards | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of target value to be paid out |  |  |  |  |  |  |  | 150.00% |  |

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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 No definition available. + Details
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