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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, 2019 $ / shares shares | Jan. 31, 2019 shares | Mar. 01, 2018 shares | Mar. 01, 2017 shares | Jan. 28, 2016 shares | Jun. 01, 2015 shares | May 17, 2013 shares | Jan. 31, 2018 shares | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) | Dec. 31, 2018 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) |  | 27,870 |  |  |  |  |  | 21,670 |  |  |  |  |
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 |  |  |  |  |  |
Common shares available for issuance (in shares) |  |  |  |  |  |  |  |  | 1,150,806 |  | 1,150,806 |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs | $ |  |  |  |  |  |  |  |  | $ 100,000 |  | $ 100,000 |  | $ 100,000
Weighted-average period for recognition of unrecognized compensation costs |  |  |  |  |  |  |  |  |  |  | 1 year 9 months 18 days |  |
Compensation expense, recognized | $ |  |  |  |  |  |  |  |  | 15,700 | $ 22,300 | $ 31,300 | $ 100,000 |
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 9 months 18 days |  |
Compensation expense, recognized | $ |  |  |  |  |  |  |  |  | 1,100,000 | $ 1,000,000.0 | $ 2,000,000.0 | $ 1,800,000 |
Exchange ratio |  |  |  |  |  |  |  |  |  |  | 1 |  |
Number of shares, Granted (in shares) |  |  |  |  |  |  |  |  |  |  | 221,853 |  | 244,917
Total unrecognized compensation cost related to LTIP Units | $ |  |  |  |  |  |  |  |  | $ 7,100,000 |  | $ 7,100,000 |  | $ 5,000,000.0
Long Term Incentive Plan Units | Awarded June 1, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
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) | 88,746 |  | 97,968 | 89,574 | 72,966 |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Time-Based | Awarded March 1, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, Granted (in shares) | 88,746 |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Performance-Based |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, Granted (in shares) | 133,107 |  | 146,949 | 134,348 | 39,285 |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Performance-Based | Awarded March 1, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares, Granted (in shares) | 133,107 |  |  |  |  |  |  |  |  |  |  |  |
Grants in period, intrinsic value, amount per share (in dollars per share) | $ / shares | $ 18.91 |  |  |  |  |  |  |  |  |  |  |  |
Long Term Incentive Plan Units, Performance-Based | Awarded March 1, 2019 | 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 | Awarded March 1, 2019 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of units paid out | 150.00% |  |  |  |  |  |  |  |  |  |  |  |

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