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Earnings per Share
 6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block]
Earnings per Share
The dilutive effect of all outstanding stock options and unvested restricted stock units and performance share awards is included in the diluted earnings per share calculations using the treasury stock method. In addition, contingently issuable restricted stock units or performance share awards for which all necessary conditions had not been met have been excluded from the calculation. Diluted earnings per share applicable to common shareholders excludes vested options for the purchase of common stock that have grant prices in excess of the average market price, or which are otherwise anti-dilutive. For the three and six months ended June 30, 2012 and 2011, respectively, less than 0.1 million shares were excluded from the calculation of diluted earnings per share applicable to common shareholder calculations, as these shares relate to anti-dilutive stock options and restricted stock-based awards as calculated using the treasury stock method and could be dilutive in the future.








Earnings per share for three and six months ended June 30, 2012 and 2011 are calculated as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2012
 
2011
 
2012
 
2011
Numerator:
 
 
 
 
 
 
 
Net income
$
10,605

 
$
12,713

 
$
15,304

 
$
60,826

Denominator:
 
 
 
 
 
 
 
Shares used in computing basic earnings per share
42,804

 
42,354

 
42,781

 
42,244

Dilutive common stock equivalents
129

 
386

 
130

 
430

Shares used in computing diluted earnings per share
42,933

 
42,740

 
42,911

 
42,674

Basic earnings per share
$
0.25

 
$
0.30

 
$
0.36

 
$
1.44

Diluted earnings per share
$
0.25

 
$
0.30

 
$
0.36

 
$
1.43