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Equity Incentive Plan - Additional Information (Details) $ / shares in Units, $ in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 15, 2020 shares | Mar. 01, 2018 $ / shares shares | Jun. 01, 2015 shares | May 17, 2013 shares | Jan. 31, 2018 shares | Jan. 31, 2017 shares | Jan. 31, 2016 shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 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) |  |  |  |  | 27,870 | 21,670 | 23,980 |  |  |
Independent Trustees | Subsequent Event |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common shares issued as compensation for services performed (in shares) | 24,516 |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  | 1,150,806 |  |
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 | $ |  |  |  |  |  |  |  | $ 0.1 | 0.1 |
Weighted - average period for recognition of unrecognized compensation costs |  |  |  |  |  |  |  | 2 years |  |
Compensation expense recognized | $ |  |  |  |  |  |  |  | $ 0.1 | $ 0.1 | $ 0.8
Shares granted (in shares) |  |  |  |  |  |  |  | 0 | 5,000 | 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 8 months 12 days |  |
Compensation expense recognized | $ |  |  |  |  |  |  |  | $ 4.2 | $ 3.6 | $ 2.5
Exchange ratio |  |  |  |  |  |  |  | 1 |  |
Shares granted (in shares) |  |  | 183,300 |  |  |  |  | 221,853 | 244,917 | 223,922
Total unrecognized compensation cost related to LTIP Units | $ |  |  |  |  |  |  |  | $ 4.9 | $ 5.0 |
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) |  | 88,746 |  |  |  |  |  |  |  |
2018 Performance-Based LTIP Unit Awards |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  | 133,107 |  |  |  |  |  |  |  |
Grants in period, intrinsic value, amount (in dollars per share) | $ / shares |  | $ 18.91 |  |  |  |  |  |  |  |
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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