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Earnings Per Share / Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Basic Earnings: |  |  |  |
Net income attributable to the Company's common shareholders / unitholders | $ 107,771 | $ 119,118 | $ 370,200 | $ 423,835
Net income attributable to the Company's common shareholders / unitholders (in shares / units) | 154,577,000 | 154,440,000 | 154,553,000 | 154,414,000
Net income (in dollars per share / unit) | $ 0.70 | $ 0.77 | $ 2.40 | $ 2.74
Allocation of undistributed earnings to participating securities |  |  |  | $ (87)
Allocation of undistributed earnings to participating securities (in shares) |  |  |  | 0
Allocation of undistributed earnings to participating securities (in dollars per shares / units) |  |  |  | $ 0
Net income attributable to the Company's common shareholders / unitholders |  |  |  | $ 423,748
Net income attributable to the Company's common shareholders / unitholders (in shares / units) |  |  |  | 154,414,000
Net income attributable to the Company's common shareholders / unitholders (in dollars per share / unit) |  |  |  | $ 2.74
Effect of Dilutive Securities: |  |  |  |
Stock Based Compensation, Income (Numerator) | $ 0 | $ 0 | $ 0 | $ 0
Stock Based Compensation, Income (in shares / units) | 243,000 | 238,000 | 294,000 | 238,000
Stock Based Compensation, Income (in dollars per share / unit) | $ 0 | $ 0 | $ (0.01) | $ 0
Diluted Earnings: |  |  |  |
Net income attributable to the Company's common shareholders / unitholders (Numerator) | $ 107,771 | $ 119,118 | $ 370,200 | $ 423,748
Net income attributable to to the Company's shareholders / unitholder (number of shares) | 154,820,000 | 154,678,000 | 154,847,000 | 154,652,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) | $ 0.70 | $ 0.77 | $ 2.39 | $ 2.74
Boston Properties Limited Partnership |  |  |  |
Entity Information [Line Items] |  |  |  |
Redeemable Common Units | 17,638,000 | 17,488,000 | 17,630,000 | 17,490,000
Basic Earnings: |  |  |  |
Net income attributable to the Company's common shareholders / unitholders | $ 122,117 | $ 136,201 | $ 421,214 | $ 483,069
Net income attributable to the Company's common shareholders / unitholders (in shares / units) | 172,215,000 | 171,928,000 | 172,183,000 | 171,904,000
Net income (in dollars per share / unit) | $ 0.71 | $ 0.79 | $ 2.45 | $ 2.81
Allocation of undistributed earnings to participating securities |  |  |  | $ (97)
Allocation of undistributed earnings to participating securities (in shares) |  |  |  | 0
Allocation of undistributed earnings to participating securities (in dollars per shares / units) |  |  |  | $ 0
Net income attributable to the Company's common shareholders / unitholders |  |  |  | $ 482,972
Net income attributable to the Company's common shareholders / unitholders (in shares / units) |  |  |  | 171,904,000
Net income attributable to the Company's common shareholders / unitholders (in dollars per share / unit) |  |  |  | $ 2.81
Effect of Dilutive Securities: |  |  |  |
Stock Based Compensation, Income (Numerator) | $ 0 | $ 0 | $ 0 | $ 0
Stock Based Compensation, Income (in shares / units) | 243,000 | 238,000 | 294,000 | 238,000
Stock Based Compensation, Income (in dollars per share / unit) | $ 0 | $ 0 | $ (0.01) | $ 0
Diluted Earnings: |  |  |  |
Net income attributable to the Company's common shareholders / unitholders (Numerator) | $ 122,117 | $ 136,201 | $ 421,214 | $ 482,972
Net income attributable to to the Company's shareholders / unitholder (number of shares) | 172,458,000 | 172,166,000 | 172,477,000 | 172,142,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) | $ 0.71 | $ 0.79 | $ 2.44 | $ 2.81

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