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Share-Based Compensation and Other Compensation Matters (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended |
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Feb. 03, 2021 shares | Jan. 13, 2020 shares | Jan. 18, 2019 shares | Jan. 01, 2018 $ / shares | Dec. 31, 2020 USD ($) rank form Percentile_Rank $ / shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | May 31, 2017 shares
Performance Shares, Profit Interest Units and Deferred Share Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Estimated pre-vesting forfeitures |  |  |  |  | 0.00% | 0.00% | 0.00% |
Restricted shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 5,600 |  |  |
Expected weighted average period during which unrecognized compensation cost will be recognized |  |  |  |  | 2 years |  |  |
Aggregate intrinsic value of shares that vested |  |  |  |  | $ 4,400 | $ 4,900 | $ 4,600 |
Grant date fair value (in dollars per share) | $ / shares |  |  |  |  | $ 25.22 | $ 26.56 | $ 25.62 |
Restricted shares | Minimum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Estimated pre-vesting forfeitures |  |  |  |  | 0.00% | 0.00% | 0.00% |
Restricted shares | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Estimated pre-vesting forfeitures |  |  |  |  | 8.00% | 8.00% | 8.00% |
Performance-based PIUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 2,200 |  |  |
Expected weighted average period during which unrecognized compensation cost will be recognized |  |  |  |  | 2 years |  |  |
Vesting period |  |  |  |  | 3 years |  |  |
Percentile ranks to fall between for PIUs | rank |  |  |  |  | 2 |  |  |
Percent of award distribution rights |  |  |  |  | 10.00% |  |  |
Performance period of the award |  |  |  |  | 3 years |  |  |
The number of percentile ranks to fall between to earn interpolated PSUs between such percentile ranks, conditioned on the percentile rank exceeding 25% | Percentile_Rank |  |  |  |  | 2 |  |  |
Time-based PIUs |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 2,100 |  |  |
Expected weighted average period during which unrecognized compensation cost will be recognized |  |  |  |  | 3 years |  |  |
Aggregate intrinsic value of shares that vested |  |  |  |  | $ 640 |  |  |
Grant date fair value (in dollars per share) | $ / shares |  |  |  |  | $ 25.47 | $ 26.01 |  |
Deferred Share Awards |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 121 |  |  |
Aggregate intrinsic value of shares that vested |  |  |  |  |  | $ 86 | $ 154 |
Grant date fair value (in dollars per share) | $ / shares |  |  |  |  | $ 23.68 | $ 27.60 | $ 28.08 |
Profit Interest Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of forms of profit interest units available to executives and trustees | form |  |  |  |  | 2 |  |  |
Performance share units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Performance period of the award |  |  |  |  | 3 years |  |  |
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 | shares |  |  |  |  |  |  |  | 3,400,000
2016 PSU Grants | Performance share units | Executives |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued for PSU awards vested in period (in shares) | shares |  |  | 44,757 |  |  |  |  |
2017 PSU Grants | Performance share units | Executives |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued for PSU awards vested in period (in shares) | shares |  | 23,181 |  |  |  |  |  |
2018 PSU Grants | Performance share units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grant date fair value (in dollars per share) | $ / shares |  |  |  | $ 31.97 |  |  |  |
Baseline Common Share Value (in dollars per share) | $ / shares |  |  |  | $ 29.20 |  |  |  |
Expected volatility of common shares (as a percent) |  |  |  | 17.00% |  |  |  |
Risk-free interest rate (as a percent) |  |  |  | 2.04% |  |  |  |
2018 PSU Grants | Performance share units | Executives | Subsequent Event [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued for PSU awards vested in period (in shares) | shares | 93,824 |  |  |  |  |  |  |

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- Definition The number of percentile ranks to fall between to earn interpolated PIUs between such percentile ranks, conditioned on the percentile rank exceeding 25%. + References No definition available. + Details
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- Definition The number of percentile ranks to fall between to earn interpolated PSUs between such percentile ranks, conditioned on the percentile rank exceeding 25%. + References No definition available. + Details
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- Definition Represents the estimated pre-vesting percentage of forfeitures considered for reduction in stock compensation expense recognized during the period. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares issued for Awards Vested in Period + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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