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Related Party Transactions (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) ft² nonemployeedirectors shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 16, 2021 shares
Related Party Transaction [Line Items] |  |  |  |
Related party note receivable, net | $ 78,336 | $ 77,552 |  |
Interest and Other Income | $ 5,704 | 5,953 | $ 18,939 |
Number Of Non Employee Directors Electing To Receive Deferred Stock Units | nonemployeedirectors | 7 |  |  |
Separate Unrestricted Cash For Deferred Compensation Plan. | $ 43,600 | 39,500 |  |
Liability for directors | $ 320,775 | $ 336,264 |  |
Common stock, shares issued | shares | 156,623,749 | 155,797,725 |  |
Reedemable deferred stock units, units | shares | 83,073 | 72,966 |  |
Boston Properties Limited Partnership |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party note receivable, net | $ 78,336 | $ 77,552 |  |
Interest and Other Income | 5,704 | 5,953 | 18,939 |
Liability for directors | $ 320,775 | $ 336,264 |  |
Reedemable deferred stock units, units | shares | 83,073 | 72,966 |  |
Three Hudson Boulevard [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Net Rentable Area (in sf) | ft² | 2,000,000 |  |  |
Ownership Percentage | 25.00% |  |  |
Related party note receivable, net | $ 80,000 |  |  |
Loans Receivable, Basis Spread on Variable Rate | 3.50% |  |  |
Interest and Other Income | $ 3,600 | $ 2,700 | 2,500 |
Director Cessation Member [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Common stock, shares issued | shares |  |  |  | 498
Director |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Separate Unrestricted Cash For Deferred Compensation Plan. | 900 | 800 |  |
Liability for directors | 900 | 800 |  |
Immediate Family Member of Management or Principal Owner |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | 0 | 914 | 21 |
Real Estate Brokerage Firm |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | $ 1,900 | $ 3,400 | $ 2,600 |

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