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Earnings per Common Share
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Net Income per Common Share
Earnings per Common Share
We present basic and diluted earnings per share. Basic earnings per share is calculated by dividing the net income attributable to the owners of QIAGEN N.V. by the weighted average number of common shares outstanding. Diluted earnings per share reflect the potential dilution that would occur if all “in the money” securities to issue common shares were exercised. The following schedule summarizes the information used to compute earnings per common share:
 
 
Years ended December 31,
(in thousands, except per share data)
2012
 
2011
 
2010
Net income attributable to the owners of QIAGEN N.V.
$
129,506

 
$
96,038

 
$
144,311

 
 
 
 
 
 
Weighted average number of common shares used to compute basic net income per common share
235,582

 
233,850

 
232,635

Dilutive effect of stock options and restrictive stock units
2,341

 
2,876

 
2,843

Dilutive effect of outstanding warrant shares
2,823

 
2,338

 
5,005

Weighted average number of common shares used to compute diluted net income per common share
240,746

 
239,064

 
240,483

Outstanding options and awards having no dilutive effect, not included in above calculation
2,906

 
3,995

 
2,152

Outstanding warrants having no dilutive effect, not included in above calculation
23,644

 
23,591

 
21,462

 
 
 
 
 
 
Basic earnings per common share attributable to the owners of QIAGEN N.V.
$
0.55

 
$
0.41

 
$
0.62

Diluted earnings per common share attributable to the owners of QIAGEN N.V.
$
0.54

 
$
0.40

 
$
0.60