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Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the computation of basic and diluted earnings per share for the years ended December 31, 2014, 2013 and 2012.

 
Years Ended December 31,
 
2014
 
2013
 
2012
 
(In thousands, except per share amounts)
Basic and diluted
 

 
 

 
 

Net income attributable to The Medicines Company
$
(32,210
)
 
$
15,512

 
$
51,254

 
 
 
 
 
 
Net weighted average common shares outstanding, basic
64,473

 
58,096

 
53,545

Plus: net effect of dilutive stock options, warrants, restricted common shares and shares issuable upon conversion of Notes
—

 
4,556

 
1,801

Weighted average common shares outstanding, diluted
64,473

 
62,652

 
55,346

Income per common share attributable to The Medicines Company, basic
$
(0.50
)
 
$
0.27

 
$
0.96

Income per common share attributable to The Medicines Company, diluted
$
(0.50
)
 
$
0.25

 
$
0.93