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Noncontrolling Interests (Property Partnerships) (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 21, 2024 USD ($) | Jun. 30, 2024 USD ($) ft² | Jun. 30, 2024 USD ($) ft² | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Jan. 05, 2023 ft²
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling Interest in Limited Partnerships |  | $ 1,801,676 | $ 1,801,676 |  | $ 1,640,704 |
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships |  | $ 67,481 | $ 210,423 | $ 7,555 |  |
Construction in Progress |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  | 3,100,000 | 3,100,000 |  |  |
290 Binney |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 45.00% |  |  |  |  |
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships | $ 97,200 |  |  |  |  |
Noncontrolling Interest, Increase from Sale of Parent Equity Interest | 104,600 | $ (15,700) | $ 35,000 |  |  |
Difference Between Proceeds from Sale and Noncontrolling Interest | $ 7,500 |  |  |  |  |
Percent of Carrying Value of Real Estate, Gross | 45.00% |  |  |  |  |
290 Binney | Construction in Progress | Office and Life Sciences Building [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  | 573,000 | 573,000 |  |  | 573,000
Leased percentage |  | 100.00% | 100.00% |  |  | 100.00%
290 Binney | Noncontrolling Interest [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 55.00% |  |  |  |  |

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