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Earnings Per Share / Common Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Basic Earnings: |  |  |  |
Net income attributable to the Company's common shareholders / unitholders | $ 128,681 | $ 133,709 | $ 304,682 | $ 230,764
Net income attributable to the Company's common shareholders / unitholders (in shares / units) | 154,415,000 | 154,177,000 | 154,400,000 | 154,019,000
Net income (in dollars per share / unit) | $ 0.83 | $ 0.87 | $ 1.97 | $ 1.50
Allocation of undistributed earnings to participating securities (numerator) | $ (16) | $ (43) | $ (142) | $ (9)
Allocation of undistributed earnings to participating securities (in shares) | 0 | 0 | 0 | 0
Allocation of undistributed earnings to participating securities (in dollars per shares / units) | $ 0 | $ 0 | $ 0 | $ 0
Net income attributable to the Company's common shareholders / unitholders | $ 128,665 | $ 133,666 | $ 304,540 | $ 230,755
Net income attributable to the Company's common shareholders / unitholders (in shares / units) | 154,415,000 | 154,177,000 | 154,400,000 | 154,019,000
Net income attributable to the Company's common shareholders / unitholders (in dollars per share / unit) | $ 0.83 | $ 0.87 | $ 1.97 | $ 1.50
Effect of Dilutive Securities: |  |  |  |
Stock Based Compensation, Income (Numerator) | $ 0 | $ 0 | $ 0 | $ 0
Stock Based Compensation, Shares / Units (Denominator) | 156,000 | 154,000 | 238,000 | 254,000
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) | $ 128,665 | $ 133,666 | $ 304,540 | $ 230,755
Net income attributable to to the Company's shareholders / unitholder (number of shares) | 154,571,000 | 154,331,000 | 154,638,000 | 154,273,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) | $ 0.83 | $ 0.87 | $ 1.97 | $ 1.50
Boston Properties Limited Partnership |  |  |  |
Entity Information [Line Items] |  |  |  |
Redeemable Common Units | 17,501,000 | 17,498,000 | 17,492,000 | 17,609,000
Basic Earnings: |  |  |  |
Net income attributable to the Company's common shareholders / unitholders | $ 145,961 | $ 151,844 | $ 346,868 | $ 262,506
Net income attributable to the Company's common shareholders / unitholders (in shares / units) | 171,916,000 | 171,675,000 | 171,892,000 | 171,628,000
Net income (in dollars per share / unit) | $ 0.85 | $ 0.88 | $ 2.02 | $ 1.53
Allocation of undistributed earnings to participating securities (numerator) | $ (18) | $ (48) | $ (158) | $ (10)
Allocation of undistributed earnings to participating securities (in shares) | 0 | 0 | 0 | 0
Allocation of undistributed earnings to participating securities (in dollars per shares / units) | $ 0 | $ 0 | $ 0 | $ 0.00
Net income attributable to the Company's common shareholders / unitholders | $ 145,943 | $ 151,796 | $ 346,710 | $ 262,496
Net income attributable to the Company's common shareholders / unitholders (in shares / units) | 171,916,000 | 171,675,000 | 171,892,000 | 171,628,000
Net income attributable to the Company's common shareholders / unitholders (in dollars per share / unit) | $ 0.85 | $ 0.88 | $ 2.02 | $ 1.53
Effect of Dilutive Securities: |  |  |  |
Stock Based Compensation, Income (Numerator) | $ 0 | $ 0 | $ 0 | $ 0
Stock Based Compensation, Shares / Units (Denominator) | 156,000 | 154,000 | 238,000 | 254,000
Stock Based Compensation, Per Share / Unit Amount (in dollars per share / unit) | $ 0.00 | $ 0.00 | $ (0.01) | $ 0.00
Diluted Earnings: |  |  |  |
Net income attributable to the Company's common shareholders / unitholders (Numerator) | $ 145,943 | $ 151,796 | $ 346,710 | $ 262,496
Net income attributable to to the Company's shareholders / unitholder (number of shares) | 172,072,000 | 171,829,000 | 172,130,000 | 171,882,000
Diluted Earnings: Net income, Per Share Amount (in dollars per share / unit) | $ 0.85 | $ 0.88 | $ 2.01 | $ 1.53

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