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Equity Incentive Plan - Additional Information (Details) |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Mar. 01, 2021 $ / shares shares | Mar. 01, 2020 shares | Mar. 01, 2019 shares | Mar. 01, 2018 shares | Mar. 01, 2017 shares | Jan. 28, 2016 shares | May 17, 2013 shares | Jan. 31, 2021 shares | Jan. 31, 2020 shares | Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) shares
Independent Trustees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common share issued as compensation for services performed (in shares) |  |  |  |  |  |  |  | 40,224 | 24,516 |  |  |  |  |
Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |
Common shares available for issuance (in shares) |  |  |  |  |  |  |  |  |  | 589,804 |  | 589,804 |  |
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 |  |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs | $ |  |  |  |  |  |  |  |  |  | $ 14,000.0 |  | $ 14,000.0 |  | $ 28,500
Weighted-average period for recognition of unrecognized compensation costs |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |
Compensation expense, recognized | $ |  |  |  |  |  |  |  |  |  | 7,200 | $ 7,300 | $ 14,500 | $ 15,500 |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  | 2 years 1 month 6 days |  |
Compensation expense, recognized | $ |  |  |  |  |  |  |  |  |  | 1,100,000 | $ 1,000,000.0 | $ 2,100,000 | $ 2,400,000 |
Exchange ratio |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  | 330,945 |  | 325,507
Total unrecognized compensation cost related to LTIP Units | $ |  |  |  |  |  |  |  |  |  | $ 7,600,000 |  | $ 7,600,000 |  | $ 4,900,000
Time-Based LTIP Unit Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 132,381 | 130,206 | 88,746 | 97,968 | 89,574 | 72,966 |  |  |  |  |  |  |  |
Time-Based LTIP Unit Awards | Awarded March 1, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 132,381 |  |  |  |  |  |  |  |  |  |  |  |  |
Performance-Based LTIP Unit Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 198,564 | 195,301 | 133,107 | 146,949 | 134,348 | 39,285 |  |  |  |  |  |  |  |
Performance-Based LTIP Unit Awards | Awarded March 1, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 198,564 |  |  |  |  |  |  |  |  |  |  |  |  |
Grants in period, intrinsic value, amount per share (in dollars per share) | $ / shares | $ 15.91 |  |  |  |  |  |  |  |  |  |  |  |  |
Performance-Based LTIP Unit Awards | Awarded March 1, 2021 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of units paid out | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Performance-Based LTIP Unit Awards | Awarded March 1, 2021 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of units paid out | 150.00% |  |  |  |  |  |  |  |  |  |  |  |  |

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