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Earnings Per Share / Common Unit (Tables) | 12 Months Ended
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Dec. 31, 2020
Entity Information [Line Items] |
Computation Of Basic And Diluted Earnings Per Share / Unit |
| Year ended December 31, 2020
| Income (Numerator) |  | Shares (Denominator) |  | Per Share Amount
| (in thousands, except for per share amounts)
Basic Earnings: |  |  |  |  |
Net income attributable to Boston Properties, Inc. common shareholders | $ | 862,227 |  |  | 155,432 |  |  | $ | 5.55 |
Allocation of undistributed earnings to participating securities | (748) |  |  | — |  |  | (0.01) |
Net income attributable to Boston Properties, Inc. common shareholders | $ | 861,479 |  |  | 155,432 |  |  | $ | 5.54 |
Effect of Dilutive Securities: |  |  |  |  |
Stock Based Compensation | — |  |  | 85 |  |  | — |
Diluted Earnings: |  |  |  |  |
Net income attributable to Boston Properties, Inc. common shareholders | $ | 861,479 |  |  | 155,517 |  |  | $ | 5.54 |
| Year ended December 31, 2019
| Income (Numerator) |  | Shares (Denominator) |  | Per Share Amount
| (in thousands, except for per share amounts)
Basic Earnings: |  |  |  |  |
Net income attributable to Boston Properties, Inc. common shareholders | $ | 511,034 |  |  | 154,582 |  |  | $ | 3.31 |
Effect of Dilutive Securities: |  |  |  |  |
Stock Based Compensation | — |  |  | 301 |  |  | (0.01) |
Diluted Earnings: |  |  |  |  |
Net income attributable to Boston Properties, Inc. common shareholders | $ | 511,034 |  |  | 154,883 |  |  | $ | 3.30 |
| Year ended December 31, 2018
| Income (Numerator) |  | Shares (Denominator) |  | Per Share Amount
| (in thousands, except for per share amounts)
Basic Earnings: |  |  |  |  |
Net income attributable to Boston Properties, Inc. common shareholders | $ | 572,347 |  |  | 154,427 |  |  | $ | 3.71 |
Allocation of undistributed earnings to participating securities | (101) |  |  | — |  |  | — |
Net income attributable to Boston Properties, Inc. common shareholders | $ | 572,246 |  |  | 154,427 |  |  | $ | 3.71 |
Effect of Dilutive Securities: |  |  |  |  |
Stock Based Compensation | — |  |  | 255 |  |  | (0.01) |
Diluted Earnings: |  |  |  |  |
Net income attributable to Boston Properties, Inc. common shareholders | $ | 572,246 |  |  | 154,682 |  |  | $ | 3.70 |
Boston Properties Limited Partnership |
Entity Information [Line Items] |
Computation Of Basic And Diluted Earnings Per Share / Unit | Included in the number of units (the denominator) below are approximately 17,211,000 and 17,618,000 and 17,485,000 redeemable common units for the years ended December 31, 2020, 2019 and 2018, respectively.
| Year ended December 31, 2020
| Income (Numerator) |  | Units (Denominator) |  | Per Unit Amount
| (in thousands, except for per unit amounts)
Basic Earnings: |  |  |  |  |
Net income attributable to Boston Properties Limited Partnership common unitholders | $ | 979,979 |  |  | 172,643 |  |  | $ | 5.68 |
Allocation of undistributed earnings to participating securities | (830) |  |  | — |  |  | (0.01) |
Net income attributable to Boston Properties Limited Partnership common unitholders | $ | 979,149 |  |  | 172,643 |  |  | $ | 5.67 |
Effect of Dilutive Securities: |  |  |  |  |
Stock Based Compensation | — |  |  | 85 |  |  | — |
Diluted Earnings: |  |  |  |  |
Net income attributable to Boston Properties Limited Partnership common unitholders | $ | 979,149 |  |  | 172,728 |  |  | $ | 5.67 |
| Year ended December 31, 2019
| Income (Numerator) |  | Units (Denominator) |  | Per Unit Amount
| (in thousands, except for per unit amounts)
Basic Earnings: |  |  |  |  |
Net income attributable to Boston Properties Limited Partnership common unitholders | $ | 580,102 |  |  | 172,200 |  |  | $ | 3.37 |
Effect of Dilutive Securities: |  |  |  |  |
Stock Based Compensation | — |  |  | 301 |  |  | (0.01) |
Diluted Earnings: |  |  |  |  |
Net income attributable to Boston Properties Limited Partnership common unitholders | $ | 580,102 |  |  | 172,501 |  |  | $ | 3.36 |
| Year ended December 31, 2018
| Income (Numerator) |  | Units (Denominator) |  | Per Unit Amount
| (in thousands, except for per unit amounts)
Basic Earnings: |  |  |  |  |
Net income attributable to Boston Properties Limited Partnership common unitholders | $ | 656,903 |  |  | 171,912 |  |  | $ | 3.82 |
Allocation of undistributed earnings to participating securities | (113) |  |  | — |  |  | — |
Net income attributable to Boston Properties Limited Partnership common unitholders | $ | 656,790 |  |  | 171,912 |  |  | $ | 3.82 |
Effect of Dilutive Securities: |  |  |  |  |
Stock Based Compensation | — |  |  | 255 |  |  | (0.01) |
Diluted Earnings: |  |  |  |  |
Net income attributable to Boston Properties Limited Partnership common unitholders | $ | 656,790 |  |  | 172,167 |  |  | $ | 3.81 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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