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Share-Based Compensation and Other Compensation Matters (Narrative) (Details) $ in Thousands |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2023 shares | Feb. 01, 2022 shares | Feb. 03, 2021 shares | Jan. 01, 2020 USD ($) shares | Jan. 01, 2019 USD ($) shares | Jan. 01, 2018 USD ($) shares | Dec. 31, 2022 USD ($) Percentile_Rank form shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | May 31, 2017 shares
Executives and Non-Employee Trustees |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated pre-vesting forfeitures |  |  |  |  |  |  | 0.00% | 0.00% | 0.00% |
All Other Employees |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated pre-vesting forfeitures |  |  |  |  |  |  | 8.00% | 8.00% | 8.00% |
Restricted shares |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  |  |  |  |  |  | $ 5,100 |  |  |
Expected weighted average period during which unrecognized compensation cost will be recognized |  |  |  |  |  |  | 2 years |  |  |
Aggregate intrinsic value of shares issued | $ |  |  |  |  |  |  | $ 4,000 | $ 4,300 | $ 4,400 |
Number of common shares issued (in shares) |  |  |  |  |  |  | 152,585 | 164,575 | 173,191 |
Stock awards granted (in shares or units) |  |  |  |  |  |  | 186,515 | 177,995 | 166,918 |
PB-PIUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  |  |  |  |  |  | $ 3,700 |  |  |
Expected weighted average period during which unrecognized compensation cost will be recognized |  |  |  |  |  |  | 2 years |  |  |
Performance period of the award |  |  |  |  |  |  | 3 years |  |  |
Percentile ranks to fall between for PIUs | Percentile_Rank |  |  |  |  |  |  | 2 |  |  |
Percent of award distribution rights |  |  |  |  |  |  | 10.00% |  |  |
TB- PIUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  |  |  |  |  |  | $ 3,000 |  |  |
Expected weighted average period during which unrecognized compensation cost will be recognized |  |  |  |  |  |  | 2 years |  |  |
Aggregate intrinsic value of shares issued | $ |  |  |  |  |  |  | $ 2,000 | $ 1,200 | $ 640 |
Number of common shares issued (in shares) |  |  |  |  |  |  | 77,709 | 45,244 | 25,182 |
Stock awards granted (in shares or units) |  |  |  |  |  |  | 101,966 | 93,983 | 98,318 |
Deferred Share Awards |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  |  |  |  |  |  | $ 85 |  |  |
Number of common shares issued (in shares) |  |  |  |  |  |  | 0 | 0 | 0 |
Stock awards granted (in shares or units) |  |  |  |  |  |  | 6,771 | 3,416 | 10,679 |
Grant Date Fair Value | $ |  |  |  |  |  |  | $ 166 | $ 93 | $ 253 |
PIUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of forms of profit interest units | form |  |  |  |  |  |  | 2 |  |  |
2017 Omnibus Equity and Incentive Plan | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of common shares of beneficial interest authorized to be issued |  |  |  |  |  |  |  |  |  | 3,400,000
2019 PB PIU | PB-PIUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares/units issued for awards vested in period (in shares of units) |  | 156,104 |  |  |  |  |  |  |  |
Stock awards granted (in shares or units) |  |  |  |  | 193,682 |  |  |  |  |
Grant Date Fair Value | $ |  |  |  |  | $ 2,415 |  |  |  |  |
2020 PB PIU | PB-PIUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock awards granted (in shares or units) |  |  |  | 176,758 |  |  |  |  |  |
Grant Date Fair Value | $ |  |  |  | $ 2,891 |  |  |  |  |  |
2020 PB PIU | PB-PIUs | Subsequent Event |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares/units issued for awards vested in period (in shares of units) | 141,152 |  |  |  |  |  |  |  |  |
2018 PSU Grants | PSUs |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Performance period of the award |  |  |  |  |  |  | 3 years |  |  |
Shares/units issued for awards vested in period (in shares of units) |  |  | 93,824 |  |  |  |  |  |  |
Stock awards granted (in shares or units) |  |  |  |  |  | 59,110 |  |  |  |
Grant Date Fair Value | $ |  |  |  |  |  | $ 1,900 |  |  |  |

X
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- Definition The aggregate fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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