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Share-Based Compensation - 2012 Equity Incentive Plan Narrative (Details) - 2012 Equity Incentive Plan	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restricted share units
Class of Stock [Line Items]
Award vesting period	3 years	3 years
Restricted share units | Non-Management Trustees
Class of Stock [Line Items]
Award vesting period	1 year
Performance Share Units (PSU's)
Class of Stock [Line Items]
Award vesting period	3 years
Service period	3 years
Performance Share Units (PSU's) | Minimum
Class of Stock [Line Items]
Percentage of units expected to vest (in percent)	0.00%
Performance Share Units (PSU's) | Maximum
Class of Stock [Line Items]
Percentage of units expected to vest (in percent)	200.00%

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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.

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-Name Accounting Standards Codification
-Topic 718
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-Section 50
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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.

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Percentage of vesting of award under share-based payment arrangement.

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