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Equity Incentive Plan - Additional Information (Details) |  |  |  | 1 Months Ended | 12 Months Ended
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Jan. 18, 2022 shares | Mar. 01, 2021 $ / shares shares | May 17, 2013 shares | Jan. 31, 2021 shares | Jan. 31, 2020 shares | Jan. 31, 2019 shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares
Independent Trustees |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Trustee fees | $ |  |  |  |  |  |  | $ 100,000 | $ 100,000 | $ 100,000
Common shares issued as compensation for services performed (in shares) |  |  |  | 40,203 | 24,516 | 27,870 |  |  |
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) | 34,672 |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  | 58.00% |  |
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) |  |  |  |  |  |  | 579,825 |  |
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 | $ |  |  |  |  |  |  | $ 99,700 | 28,500 |
Weighted - average period for recognition of unrecognized compensation costs |  |  |  |  |  |  | 2 years 7 months 6 days |  |
Compensation expense recognized | $ |  |  |  |  |  |  | $ 43,500 | $ 30,000 | $ 62,700
Shares granted (in shares) |  |  |  |  |  |  | 10,000 | 0 | 0
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 | $ |  |  |  |  |  |  | $ 4,300,000 | $ 4,400,000 | $ 4,200,000
Exchange ratio |  |  |  |  |  |  | 1 |  |
Shares granted (in shares) |  |  |  |  |  |  | 330,945 | 325,507 | 221,853
Total unrecognized compensation cost related to LTIP Units | $ |  |  |  |  |  |  | $ 5,400,000 | $ 4,900,000 |
2021 Time-Based LTIP Unit Award |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  | 132,381 |  |  |  |  |  |  |
2021 Performance-Based LTIP Unit Awards |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  | 198,564 |  |  |  |  |  |  |
Grants in period, intrinsic value, amount (in dollars per share) | $ / shares |  | $ 15.91 |  |  |  |  |  |  |
2021 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% |  |
2021 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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