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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Basic Earnings:    
Income from continuing operations attributable to Boston Properties, Inc., Income (Numerator) $ 32,671 $ 47,945
Net income attributable to Boston Properties Inc., Shares (Denominator) 151,646 148,343
Income from continuing operations attributable to Boston Properties, Inc., Per Share Amount (in dollars per share) $ 0.22 $ 0.33
Discontinued operations attributable to Boston Properties, Inc., Income (Numerator) 15,183 509
Discontinued operations attributable to Boston Properties, Inc., Per Share Amount (in dollars per share) $ 0.10 $ 0.00
Net Income (Loss) Available to Common Stockholders, Basic 47,854 48,454
Net income (in dollars per share) $ 0.32 $ 0.33
Effect of Dilutive Securities:    
Stock Based Compensation and Exchangeable Senior Notes, Income (Numerator) 0 0
Stock Based Compensation and Exchangeable Senior Notes, Shares (Denominator) 306 403
Stock Based Compensation and Exchangeable Senior Notes, Per Share Amount (in dollars per share) $ (0.01) $ 0.00
Diluted Earnings:    
Diluted Earnings: Net income, Income (Numerator) $ 47,854 $ 48,454
Diluted Earnings: Net income, Shares (Denominator) 151,952 148,746
Diluted Earnings: Net income, Per Share Amount (in dollars per share) $ 0.31 $ 0.33