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Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013, 2012 and 2011.

 
Years Ended December 31,
 
2013
 
2012
 
2011
 
(In thousands, except per share amounts)
Basic and diluted
 

 
 

 
 

Net income attributable to The Medicines Company
$
15,512

 
$
51,254

 
$
127,877

 
 
 
 
 
 
Net weighted average common shares outstanding, basic
58,096

 
53,545

 
53,496

Plus: net effect of dilutive stock options, warrants, restricted common shares and shares issuable upon conversion of Notes
4,556

 
1,801

 
911

Weighted average common shares outstanding, diluted
62,652

 
55,346

 
54,407

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

 
$
0.96

 
$
2.39

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

 
$
0.93

 
$
2.35