Number of trading days preceding the reporting date for which average of closing price of common shares is taken.

No definition available.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exchange Ratio

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Percentage of Target Value to be Paid Out

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No definition available.

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- Definition

Trustee Fees, Paid In Shares, Percentage

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No definition available.

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- Definition

Unrecognized compensation cost related to long term incentive plan units.

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No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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.

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- Definition

The number of grants made 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).

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- Definition

Per share or unit weighted-average intrinsic value of award granted under share-based payment arrangement. Excludes share and unit options.

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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.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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- Definition

Fees charged annually for the professional services of a trustee, usually quoted as a percentage of the funds being managed. The fee for appointing an offshore Trustee is included in the trust price.

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Equity Incentive Plan - Additional Information (Details) $ / shares in Units, $ in Millions					1 Months Ended			12 Months Ended
	Jan. 15, 2020 shares	Mar. 01, 2018 $ / shares shares	Jun. 01, 2015 shares	May 17, 2013 shares	Jan. 31, 2018 shares	Jan. 31, 2017 shares	Jan. 31, 2016 shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares
Independent Trustees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Trustee fees \| $								$ 0.1	$ 0.1	$ 0.1
Common shares issued as compensation for services performed (in shares)					27,870	21,670	23,980
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)	24,516
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)								50.00%
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)								1,150,806
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 \| $								$ 0.1	0.1
Weighted - average period for recognition of unrecognized compensation costs								2 years
Compensation expense recognized \| $								$ 0.1	$ 0.1	$ 0.8
Shares granted (in shares)								0	5,000	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 8 months 12 days
Compensation expense recognized \| $								$ 4.2	$ 3.6	$ 2.5
Exchange ratio								1
Shares granted (in shares)			183,300					221,853	244,917	223,922
Total unrecognized compensation cost related to LTIP Units \| $								$ 4.9	$ 5.0
Long Term Incentive Plan Units \| Awarded June 1, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)			183,300
2018 Time-Based LTIP Unit Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)		88,746
2018 Performance-Based LTIP Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)		133,107
Grants in period, intrinsic value, amount (in dollars per share) \| $ / shares		$ 18.91
2018 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%
2018 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%