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Noncontrolling Interests (Property Partnerships) (Narrative) (Details) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 13, 2023 USD ($) Buildings | Jul. 28, 2023 USD ($) | Dec. 31, 2023 USD ($) Real_Estate_Properties | Dec. 31, 2023 USD ($) Real_Estate_Properties | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling Interest in Limited Partnerships |  |  | $ 1,640,704 | $ 1,640,704 | $ 1,547,317 |
Contribution of Property |  |  |  | 17,519 | 0 | $ 0
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships |  |  |  | $ 244,541 | $ 849 | $ 18,002
Construction in Progress |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Number of real estate properties | Real_Estate_Properties |  |  | 10 | 10 |  |
Noncontrolling Interest [Member] | 343 Madison Avenue |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 45.00% |  |  |  |
Parent | 343 Madison Avenue |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 55.00% |  |  |  |
343 Madison Avenue | Noncontrolling Interest [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Payments to Acquire Investments |  | $ 4,800 |  |  |  |
Contribution of Property |  | 17,500 |  |  |  |
343 Madison Avenue | Parent |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Payments to Acquire Investments |  | 5,900 |  |  |  |
Contribution of Property |  | $ 21,400 |  |  |  |
300 Binney and 290 Binney | Construction in Progress |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 45.00% |  |  |  |  |
Number of real estate properties | Buildings | 2 |  |  |  |  |
300 Binney Street |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Proceeds from sale of interest in property partnerships and contributions from noncontrolling interests in property partnerships | $ 212,900 |  |  |  |  |
Noncontrolling Interest, Increase from Sale of Parent Equity Interest | 35,500 |  | $ 17,000 |  |  |
Difference Between Proceeds from Sale and Noncontrolling Interest | $ 177,400 |  |  |  |  |
300 Binney Street | Noncontrolling Interest [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 45.00% |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 55.00% |  |  |  |  |

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