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Earnings Per Share / Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Basic Earnings: |  |  |  |
Net income attributable to the Company's common shareholders / unitholders | $ 119,118 | $ 117,337 | $ 423,835 | $ 348,086
Net income attributable to the Company's common shareholders / unitholders (in shares / units) | 154,440,000 | 154,355,000 | 154,414,000 | 154,132,000
Net income (in dollars per share / unit) | $ 0.77 | $ 0.76 | $ 2.74 | $ 2.26
Allocation of undistributed earnings to participating securities (numerator) |  | $ (7) | $ (87) | $ (15)
Allocation of undistributed earnings to participating securities (in shares) |  | 0 | 0 | 0
Allocation of undistributed earnings to participating securities (in dollars per shares / units) |  | $ 0 | $ 0 | $ 0
Net income attributable to the Company's common shareholders / unitholders |  | $ 117,330 | $ 423,748 | $ 348,071
Net income attributable to the Company's common shareholders / unitholders (in shares / units) |  | 154,355,000 | 154,414,000 | 154,132,000
Net income attributable to the Company's common shareholders / unitholders (in dollars per share / unit) |  | $ 0.76 | $ 2.74 | $ 2.26
Effect of Dilutive Securities: |  |  |  |
Stock Based Compensation, Income (Numerator) | $ 0 | $ 0 | $ 0 | $ 0
Stock Based Compensation, Shares / Units (Denominator) | 238,000 | 128,000 | 238,000 | 212,000
Stock Based Compensation, Per Share / Unit Amount (in dollars per share / unit) | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00
Diluted Earnings: |  |  |  |
Net income attributable to the Company's common shareholders / unitholders (Numerator) | $ 119,118 | $ 117,330 | $ 423,748 | $ 348,071
Net income attributable to to the Company's shareholders / unitholder (number of shares) | 154,678,000 | 154,483,000 | 154,652,000 | 154,344,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) | $ 0.77 | $ 0.76 | $ 2.74 | $ 2.26
Boston Properties Limited Partnership |  |  |  |
Entity Information [Line Items] |  |  |  |
Redeemable Common Units | 17,488,000 | 17,336,000 | 17,490,000 | 17,517,000
Basic Earnings: |  |  |  |
Net income attributable to the Company's common shareholders / unitholders | $ 136,201 | $ 132,693 | $ 483,069 | $ 395,199
Net income attributable to the Company's common shareholders / unitholders (in shares / units) | 171,928,000 | 171,691,000 | 171,904,000 | 171,649,000
Net income (in dollars per share / unit) | $ 0.79 | $ 0.77 | $ 2.81 | $ 2.30
Allocation of undistributed earnings to participating securities (numerator) |  | $ (8) | $ (97) | $ (17)
Allocation of undistributed earnings to participating securities (in shares) |  | 0 | 0 | 0
Allocation of undistributed earnings to participating securities (in dollars per shares / units) |  | $ 0 | $ 0 | $ 0.00
Net income attributable to the Company's common shareholders / unitholders |  | $ 132,685 | $ 482,972 | $ 395,182
Net income attributable to the Company's common shareholders / unitholders (in shares / units) |  | 171,691,000 | 171,904,000 | 171,649,000
Net income attributable to the Company's common shareholders / unitholders (in dollars per share / unit) |  | $ 0.77 | $ 2.81 | $ 2.30
Effect of Dilutive Securities: |  |  |  |
Stock Based Compensation, Income (Numerator) | $ 0 | $ 0 | $ 0 | $ 0
Stock Based Compensation, Shares / Units (Denominator) | 238,000 | 128,000 | 238,000 | 212,000
Stock Based Compensation, Per Share / Unit Amount (in dollars per share / unit) | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.00
Diluted Earnings: |  |  |  |
Net income attributable to the Company's common shareholders / unitholders (Numerator) | $ 136,201 | $ 132,685 | $ 482,972 | $ 395,182
Net income attributable to to the Company's shareholders / unitholder (number of shares) | 172,166,000 | 171,819,000 | 172,142,000 | 171,861,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) | $ 0.79 | $ 0.77 | $ 2.81 | $ 2.30

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