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Earnings Per Share / Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Basic Earnings: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to the Company's shareholders/unitholders (Numerator) |  |  |  |  |  |  |  |  | $ 451,939 | $ 502,285 | $ 572,606
Net income attributable to the Company in Shares / Units (Denominator) |  |  |  |  |  |  |  |  | 154,190,000 | 153,715,000 | 153,471,000
Net income attributable to the Company's shareholders/unitholders (in dollars per share / unit) |  |  |  |  |  |  |  |  | $ 2.93 | $ 3.27 | $ 3.73
Allocation of undistributed earnings to participating securities (Numerator) |  |  |  |  |  |  |  |  |  | $ (283) |
Allocation of undistributed earnings to participating securities (in shares) (Denominator) |  |  |  |  |  |  |  |  |  | 0 |
Allocation of undistributed earnings to participating securities (in dollars per share / unit) |  |  |  |  |  |  |  |  |  | $ 0 |
Net income attributable to the Company Per Share / Unit Amount (in dollars per share / unit) | $ 0.67 | $ 0.76 | $ 0.87 | $ 0.63 | $ 0.96 | $ 0.50 | $ 0.63 | $ 1.18 | $ 2.93 | $ 3.27 | $ 3.73
Net Income Available To Common Stockholders After Allocation of Undistributed Earnings to Participating Securities Basic |  |  |  |  |  |  |  |  |  | $ 502,002 |
Weighted Average Number Of Shares Outstanding After Allocation of Undistributed Earnings to Participating Securities Basic (in shares) |  |  |  |  |  |  |  |  |  | 153,715,000 |
Earnings Per Share After Allccation of Undistributed Earnings to Particiapting Securities Basic (dollars per share) |  |  |  |  |  |  |  |  |  | $ 3.27 |
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |
Stock Based Compensation (Numerator) |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Stock Based Compensation, Shares / Units (Denominator) |  |  |  |  |  |  |  |  | 200,000 | 262,000 | 373,000
Stock Based Compensation Per Share / Unit Amount |  |  |  |  |  |  |  |  | $ 0.00 | $ (0.01) | $ (0.01)
Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |
Diluted Earnings: Net income attributable to the Company's shareholders/unitholdersIncome (Numerator) |  |  |  |  |  |  |  |  | $ 451,939 | $ 502,002 | $ 572,606
Diluted Earnings Net income attributable to the Company's shareholders/unitholders Shares / Units (Denominator) |  |  |  |  |  |  |  |  | 154,390,000 | 153,977,000 | 153,844,000
Diluted Earnings: Net income, Per Share / Unit Amount (in dollars per share / unit) | 0.67 | 0.76 | 0.87 | 0.63 | 0.96 | 0.50 | 0.63 | 1.18 | $ 2.93 | $ 3.26 | $ 3.72
Boston Properties Limited Partnership |  |  |  |  |  |  |  |  |  |  |
Redeemable Common Units |  |  |  |  |  |  |  |  | 17,471,000 | 17,646,000 | 17,668,000
Basic Earnings: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to the Company's shareholders/unitholders (Numerator) |  |  |  |  |  |  |  |  | $ 512,866 | $ 575,341 | $ 648,748
Net income attributable to the Company in Shares / Units (Denominator) |  |  |  |  |  |  |  |  | 171,661,000 | 171,361,000 | 171,139,000
Net income attributable to the Company's shareholders/unitholders (in dollars per share / unit) |  |  |  |  |  |  |  |  | $ 2.99 | $ 3.36 | $ 3.79
Allocation of undistributed earnings to participating securities (Numerator) |  |  |  |  |  |  |  |  |  | $ (316) |
Allocation of undistributed earnings to participating securities (in shares) (Denominator) |  |  |  |  |  |  |  |  |  | 0 |
Allocation of undistributed earnings to participating securities (in dollars per share / unit) |  |  |  |  |  |  |  |  |  | $ 0 |
Net income attributable to the Company Per Share / Unit Amount (in dollars per share / unit) | 0.69 | 0.77 | 0.88 | 0.64 | 0.97 | 0.53 | 0.64 | 1.21 | $ 2.99 | $ 3.36 | $ 3.79
Effect of Dilutive Securities: |  |  |  |  |  |  |  |  |  |  |
Stock Based Compensation (Numerator) |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
Stock Based Compensation, Shares / Units (Denominator) |  |  |  |  |  |  |  |  | 200,000 | 262,000 | 373,000
Stock Based Compensation Per Share / Unit Amount |  |  |  |  |  |  |  |  | $ (0.01) | $ (0.01) | $ (0.01)
Diluted Earnings: |  |  |  |  |  |  |  |  |  |  |
Diluted Earnings: Net income attributable to the Company's shareholders/unitholdersIncome (Numerator) |  |  |  |  |  |  |  |  | $ 512,866 | $ 575,025 | $ 648,748
Diluted Earnings Net income attributable to the Company's shareholders/unitholders Shares / Units (Denominator) |  |  |  |  |  |  |  |  | 171,861,000 | 171,623,000 | 171,512,000
Diluted Earnings: Net income, Per Share / Unit Amount (in dollars per share / unit) | $ 0.68 | $ 0.77 | $ 0.88 | $ 0.64 | $ 0.97 | $ 0.53 | $ 0.64 | $ 1.21 | $ 2.98 | $ 3.35 | $ 3.78

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