Stock-based Compensation - Summary of Activity in the Trust's Restricted Share Units (Details)	9 Months Ended
Sep. 30, 2020 $ / shares shares
Weighted Average Grant Date Fair Value
Share-based payment arrangement, shares withheld for tax withholding obligation (in shares)	65,513
2013 Plan \| Executive Awards
Restricted Share Units
Non-vested at the beginning of the period (in shares)	654,752
Granted (in shares)	482,646
Vested (in shares)	(173,259)
Non-vested at the end of the period (in shares)	964,139
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share) \| $ / shares	$ 22.99
Granted (in dollars per share) \| $ / shares	21.64
Vested (in dollars per share) \| $ / shares	29.34
Non-vested at end of period (in dollars per share) \| $ / shares	$ 21.17
Common stock, shares issued (in shares)	147,765
2013 Plan \| Trustee Awards
Restricted Share Units
Non-vested at the beginning of the period (in shares)	67,297
Granted (in shares)	38,858
Vested (in shares)	(46,335)
Non-vested at the end of the period (in shares)	59,820
Weighted Average Grant Date Fair Value
Non-vested at beginning of period (in dollars per share) \| $ / shares	$ 16.72
Granted (in dollars per share) \| $ / shares	19.30
Vested (in dollars per share) \| $ / shares	16.19
Non-vested at end of period (in dollars per share) \| $ / shares	$ 18.81

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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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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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).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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