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Net Income Attributable To IPG Photonics Corporation Per Share
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Net Income Attributable To IPG Photonics Corporation Per Share
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION PER SHARE
The following table sets forth the computation of diluted net income attributable to IPG Photonics Corporation per share:
 
 
Three Months Ended March 31,
 
2013
 
2012
Net income attributable to IPG Photonics Corporation
$
35,127

 
$
29,915

Adjustments to redemption value of redeemable noncontrolling interests
—

 
493

Net income attributable to common stockholders
35,127

 
30,408

Weighted average shares
51,407

 
48,446

Dilutive effect of common stock equivalents
943

 
1,136

Diluted weighted average common shares
52,350

 
49,582

Basic net income attributable to IPG Photonics Corporation per share
$
0.68

 
$
0.62

Adjustments to redemption value of redeemable noncontrolling interests
—

 
0.01

Basic net income attributable to common stockholders
$
0.68

 
$
0.63

Diluted net income attributable to IPG Photonics Corporation per share
$
0.67

 
$
0.60

Adjustments to redemption value of redeemable noncontrolling interests
—

 
0.01

Diluted net income attributable to common stockholders
$
0.67

 
$
0.61


The computation of diluted weighted average common shares excludes options to purchase 238,000 and 363,000 shares for the three months ended March 31, 2013 and 2012, respectively, because the effect would be anti-dilutive.

The Company computes net income per share in accordance with ASC 260-Earnings Per Share. Under the provisions of ASC 260, the Company is required to present basic and diluted earnings per share information separately for each class of equity instruments that participate in any income distribution with primary equity instruments. The Company calculates earnings per share in periods where a class of common stock was redeemable for other than fair value through the application of the two-class method. Until June 29, 2012, the Company had redeemable noncontrolling interests reported in the accompanying consolidated financial statements related to a 22.5% minority interest of the Company's Russian subsidiary, NTO IRE-Polus.