Amount, after tax, of expense for award under share-based payment arrangement.

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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://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
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-Section 50
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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.

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No definition available.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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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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No definition available.

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- References

No definition available.

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- Definition

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).

+ References

No definition available.

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- Definition

Percentage of share based compensation notional amount granted.

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Percentage Breakdown

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No definition available.

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- Definition

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

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- Definition

The aggregate notional amount of the out performance plan.

+ References

No definition available.

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- Definition

Share Based Compensation Equity Instruments Other Than Stock Options And Restricted Stock Units Earned String

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- Definition

Share Based Compensation, Percent Vested, Year Five

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- Definition

Share Based Compensation, Percent Vested, Year Four

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Stock-based Compensation (Out Performance Plans Narrative) (Details) - USD ($)		12 Months Ended
	Jan. 12, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Full Value Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)		2,803,000
Long-Term Performance Award 2022
Out Performance Plan
Out of performance plan notional amount		$ 17,025,000
Grant-date fair value		7,847,000
Share-based compensation expense		$ 4,033,000
Long-Term Performance Award 2022 \| Operational
Out Performance Plan
Percentage breakdown of awards	50.00%
Long-Term Performance Award 2022 \| Operational \| Comparable FFO per Share
Out Performance Plan
Percentage breakdown of awards	75.00%
Long-Term Performance Award 2022 \| Operational \| ESG Performance Metrics
Out Performance Plan
Percentage breakdown of awards	25.00%
Long-Term Performance Award 2022 \| Relative
Out Performance Plan
Percentage breakdown of awards	50.00%
Percentage reduction threshold	30.00%
Duration of performance measurement period	3 years
Long-Term Performance Award 2022 \| Relative \| SNL US Office REIT Index
Out Performance Plan
Percentage reduction threshold	50.00%
Long-Term Performance Award 2022 \| Relative \| Northeast Peer Group Custom Index
Out Performance Plan
Percentage reduction threshold	50.00%
Long-Term Performance Award 2022 \| Absolute
Out Performance Plan
Percentage reduction threshold	30.00%
Award requisite service period	1 year
Long-Term Performance Award 2022 \| Absolute \| Chief Executive Officer
Out Performance Plan
Award requisite service period	3 years
Long-Term Performance Award 2022 \| Absolute \| Maximum
Out Performance Plan
Percent vested, year four	50.00%
Percent vested, year five	50.00%
OPPs
Out Performance Plan
Share-based compensation expense			$ 6,140,000	$ 7,583,000
OPPs \| Absolute \| Minimum
Out Performance Plan
Duration of performance measurement period		3 years
OPPs \| Absolute \| Maximum
Out Performance Plan
Duration of performance measurement period		4 years
Out Performance Plan 2021
Out Performance Plan
Out of performance plan notional amount		$ 30,000,000
Grant-date fair value		$ 9,950,000
Percentage of notional amount granted		99.10%
OPP Units Earned		To be determined in 2025
Out Performance Plan 2020
Out Performance Plan
Out of performance plan notional amount		$ 35,000,000
Grant-date fair value		$ 11,700,000
Percentage of notional amount granted		94.00%
OPP Units Earned		To be determined in 2023
2019 Omnibus Share Plan \| Full Value Awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)		5,500,000
2019 Omnibus Share Plan \| Not Full Value Awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)		11,000,000