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Earnings Per Share / Common Unit | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Share | 15. Earnings Per Share / Common Unit Boston Properties, Inc. The following table provides a reconciliation of both the net income attributable to Boston Properties, Inc. common shareholders and the number of common shares used in the computation of basic earnings per share (“EPS”), which is calculated by dividing net income attributable to Boston Properties, Inc. common shareholders by the weighted-average number of common shares outstanding during the period. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities. As such, unvested restricted common stock of Boston Properties, Inc. and Boston Properties Limited Partnership’s LTIP Units, 2012 OPP Units and MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic EPS of Boston Properties, Inc. using the two-class method. Participating securities are included in the computation of diluted EPS of Boston Properties, Inc. using the if-converted method if the impact is dilutive. Because the 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units required, and the 2015-2017 MYLTIP Units require, Boston Properties, Inc. to outperform absolute and relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, Boston Properties, Inc. excludes such units from the diluted EPS calculation. Other potentially dilutive common shares, including stock options, restricted stock and other securities of Boston Properties Limited Partnership that are exchangeable for Boston Properties, Inc.’s Common Stock, and the related impact on earnings, are considered when calculating diluted EPS.
| For the Year Ended December 31, 2017
| 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 | $ | 451,939 |  |  | 154,190 |  |  | $ | 2.93 |
Effect of Dilutive Securities: |  |  |  |  |
Stock Based Compensation | — |  |  | 200 |  |  | — |
Diluted Earnings: |  |  |  |  |
Net income attributable to Boston Properties, Inc. common shareholders | $ | 451,939 |  |  | 154,390 |  |  | $ | 2.93 |
| For the Year Ended December 31, 2016
| 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 | $ | 502,285 |  |  | 153,715 |  |  | $ | 3.27 |
Allocation of undistributed earnings to participating securities | (283 | ) |  | — |  |  | — |
Net income attributable to Boston Properties, Inc. common shareholders | $ | 502,002 |  |  | 153,715 |  |  | $ | 3.27 |
Effect of Dilutive Securities: |  |  |  |  |
Stock Based Compensation | — |  |  | 262 |  |  | (0.01 | )
Diluted Earnings: |  |  |  |  |
Net income attributable to Boston Properties, Inc. common shareholders | $ | 502,002 |  |  | 153,977 |  |  | $ | 3.26 |
| For the Year Ended December 31, 2015
| 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 | $ | 572,606 |  |  | 153,471 |  |  | $ | 3.73 |
Effect of Dilutive Securities: |  |  |  |  |
Stock Based Compensation | — |  |  | 373 |  |  | (0.01 | )
Diluted Earnings: |  |  |  |  |
Net income attributable to Boston Properties, Inc. common shareholders | $ | 572,606 |  |  | 153,844 |  |  | $ | 3.72 |
Boston Properties Limited Partnership The following table provides a reconciliation of both the net income attributable to Boston Properties Limited Partnership common unitholders and the number of common units used in the computation of basic earnings per common unit, which is calculated by dividing net income attributable to Boston Properties Limited Partnership common unitholders by the weighted-average number of common units outstanding during the period. Unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities. As such, unvested restricted common stock of Boston Properties, Inc. and Boston Properties Limited Partnership’s LTIP Units, 2012 OPP Units and MYLTIP Units are considered participating securities. Participating securities are included in the computation of basic earnings per common unit using the two-class method. Participating securities are included in the computation of diluted earnings per common unit using the if-converted method if the impact is dilutive. Because the 2012 OPP Units, 2013 MYLTIP Units and 2014 MYLTIP Units required, and the 2015-2017 MYLTIP Units require, Boston Properties, Inc. to outperform absolute and relative return thresholds, unless such thresholds have been met by the end of the applicable reporting period, Boston Properties Limited Partnership excludes such units from the diluted earnings per common unit calculation. Other potentially dilutive common units and the related impact on earnings are considered when calculating diluted earnings per common unit. Included in the number of units (the denominator) below are approximately 17,471,000, 17,646,000 and 17,668,000 redeemable common units for the years ended December 31, 2017, 2016 and 2015, respectively.
| For the Year Ended December 31, 2017
| 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 | $ | 512,866 |  |  | 171,661 |  |  | $ | 2.99 |
Effect of Dilutive Securities: |  |  |  |  |
Stock Based Compensation | — |  |  | 200 |  |  | (0.01 | )
Diluted Earnings: |  |  |  |  |
Net income attributable to Boston Properties Limited Partnership common unitholders | $ | 512,866 |  |  | 171,861 |  |  | $ | 2.98 |
| For the Year Ended December 31, 2016
| 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 | $ | 575,341 |  |  | 171,361 |  |  | $ | 3.36 |
Allocation of undistributed earnings to participating securities | (316 | ) |  | — |  |  | — |
Net income attributable to Boston Properties Limited Partnership common unitholders | $ | 575,025 |  |  | 171,361 |  |  | $ | 3.36 |
Effect of Dilutive Securities: |  |  |  |  |
Stock Based Compensation | — |  |  | 262 |  |  | (0.01 | )
Diluted Earnings: |  |  |  |  |
Net income attributable to Boston Properties Limited Partnership common unitholders | $ | 575,025 |  |  | 171,623 |  |  | $ | 3.35 |
| For the Year Ended December 31, 2015
| 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 | $ | 648,748 |  |  | 171,139 |  |  | $ | 3.79 |
Effect of Dilutive Securities: |  |  |  |  |
Stock Based Compensation | — |  |  | 373 |  |  | (0.01 | )
Diluted Earnings: |  |  |  |  |
Net income attributable to Boston Properties Limited Partnership common unitholders | $ | 648,748 |  |  | 171,512 |  |  | $ | 3.78 |

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