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

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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.

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- Definition

The period of time during which the performance of the stock will be evaluated to calculate the earning of the stock based awards.

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The fair value at grant date for 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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Share-based Compensation Arrangement by Share-based Payment Award, Percentage Breakdown

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Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage Reduction Threshold

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Share Based Compensation, Percent Vested, Year Four

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Share Based Compensation, Percent Vested, Year Three

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Stock-based Compensation (LTPP Units & OPP Units) (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands		12 Months Ended			37 Months Ended
	Feb. 10, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Feb. 10, 2025
LTPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant-date fair value		$ 0	$ 9,491	$ 7,847
Share-based compensation expense			$ 4,670	$ 4,033
Long-Term Performance Award 2022 \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units earned under the plan (in shares)	168,371				240,027
OPP Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance vesting period		4 years
Out Performance Plan 2021 \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units earned under the plan (in shares)	827,644
Operational \| LTPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage breakdown of awards		50.00%
Operational \| LTPP \| Comparable FFO per Share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage breakdown of awards		75.00%
Operational \| LTPP \| Sustainability Performance Metrics
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage breakdown of awards		25.00%
Relative \| LTPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage breakdown of awards		50.00%
Percentage reduction threshold		30.00%
Duration of performance measurement period		3 years
Relative \| LTPP \| Dow Jones U.S. Real Estate Office Index
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage reduction threshold		50.00%
Relative \| LTPP \| Northeast Peer Group Custom Index
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage reduction threshold		50.00%
Absolute \| LTPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage reduction threshold		30.00%
Award requisite service period (in years)		1 year
Absolute \| LTPP \| Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period (in years)		3 years
Absolute \| LTPP \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent vested, year three		50.00%
Percent vested, year four		50.00%
Absolute \| Long-Term Performance Award 2022 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent vested, year three		50.00%
Percent vested, year four		50.00%