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Stock Option and Incentive Plan Stock and Units (Narrative) (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) days $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Feb. 07, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued | shares | 157,019,766 | 156,836,767 |  |
Stock based compensation expense | $ | $ 50,200 | $ 50,700 | $ 49,700 |
Common Stock, Value, Issued | $ | $ 1,569 | $ 1,568 |  |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued | shares | 73,762 | 41,818 | 57,383 |
LTIP Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Value Of LTIP Units Issued | $ | $ 29,900 | $ 28,900 | $ 23,800 |
Weighted average price (per unit) | $ / shares | $ 69.29 | $ 103.06 | $ 84.43 |
Expected life assumed to calculate per unit fair value per LTIP unit (in years) | 5 years 8 months 12 days | 5 years 8 months 12 days | 5 years 8 months 12 days |
Risk-free rate | 3.67% | 1.71% | 0.65% |
Expected price volatility | 32.00% | 31.00% | 30.00% |
Employee Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued | shares | 18,552 | 9,813 | 9,846 |
Weighted Average Price of Shares Purchased | $ / shares | $ 51.93 | $ 87.30 | $ 89.73 |
Number of Business Days, Average Closing Price | days | 10 |  |  |
MYLTIP 2023 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Value of MYLTIP Awards | $ |  |  |  | $ 13,100
Boston Properties Limited Partnership | LTIP Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued | shares | 430,824 | 280,616 | 281,640 |
Boston Properties Limited Partnership | MYLTIP 2023 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued | shares | 322,053 |  |  |
Boston Properties Limited Partnership | MYLTIP 2022 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued | shares |  | 254,061 |  |
Boston Properties Limited Partnership | MYLTIP 2021 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares issued | shares |  |  | 352,021 |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee and director payment per share (in dollars per share) | $ / shares | $ 0.01 |  |  |
Common Stock, Value, Issued | $ | $ 5,400 | $ 4,700 | $ 5,800 |
Common Stock Weighted Average Price (in dollars per share) | $ / shares | $ 72.57 | $ 111.47 | $ 100.60 |
LTIP and MYLTIP Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee and director payment per share (in dollars per share) | $ / shares | $ 0.25 |  |  |
Ltips (including vested MYLTIPS) And Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expenses | $ | $ 20,700 |  |  |
Unvested MYLTIP Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expenses | $ | $ 300 |  |  |
Weighted-average period (years) | 2 years 6 months |  |  |

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