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Basis Of Presentation And Summary Of Significant Accounting Policies Narrative (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |
Number of VIEs that are consolidated | 6 |
Redeemable deferred stock units—54,610 units outstanding at redemption value at September 30, 2019 | $ 7,081 | $ 0
Accounts payable and accrued expenses | $ 421,269 | 276,645
In-service Properties [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Number of VIEs that are consolidated | 5 |
Boston Properties Limited Partnership |  |
Schedule of Equity Method Investments [Line Items] |  |
Redeemable deferred stock units—54,610 units outstanding at redemption value at September 30, 2019 | $ 7,081 | 0
Accounts payable and accrued expenses | 421,269 | $ 276,645
Deferred Compensation for Directors [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in classification of director deferred compensation plan | 7,900 |
Redeemable deferred stock units—54,610 units outstanding at redemption value at September 30, 2019 | 7,300 |
Accounts payable and accrued expenses | 600 |
Deferred Compensation for Directors [Member] | Boston Properties Limited Partnership |  |
Schedule of Equity Method Investments [Line Items] |  |
Change in classification of director deferred compensation plan | 7,900 |
Redeemable deferred stock units—54,610 units outstanding at redemption value at September 30, 2019 | 7,300 |
Accounts payable and accrued expenses | $ 600 |

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