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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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Stock-based Compensation (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 12, 2022	Mar. 31, 2022	Mar. 31, 2021
General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ 13,155	$ 21,225
Operational \| Long-Term Performance Award 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage breakdown of awards	50.00%
Operational \| Long-Term Performance Award 2022 \| Comparable FFO per Share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage breakdown of awards	75.00%
Operational \| Long-Term Performance Award 2022 \| ESG Performance Metrics
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage breakdown of awards	25.00%
Relative \| Long-Term Performance Award 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage breakdown of awards	50.00%
Percentage reduction threshold	30.00%
Measurement period (years)	3 years
Relative \| Long-Term Performance Award 2022 \| Dow Jones U.S. Real Estate Office Index
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of benchmark	50.00%
Relative \| Long-Term Performance Award 2022 \| Northeast Peer Group Custom Index
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of benchmark	50.00%
Absolute \| Long-Term Performance Award 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage reduction threshold	30.00%
Absolute \| Maximum \| Long-Term Performance Award 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent vested, year four	50.00%
Percent vested, year five	50.00%