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Stock-based Compensation (LTPP Units & OPP Units) (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands		1 Months Ended	12 Months Ended
	Feb. 09, 2026	Feb. 28, 2025	Dec. 31, 2025	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024
LTPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant-date fair value			$ 0	$ 9,491		$ 0
Share-based compensation expense				$ 4,670
Units earned under the plan (in shares)				653,779
LTPP \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units earned under the plan (in shares)	437,642
Long-Term Performance Award 2022
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
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%