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Net Income (Loss) Per Share (Tables)
6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Computation Of Net Income (Loss) Per Share
The computation of earnings per share is as follows:

 
Three Months Ended
 
Six Months Ended
 
June 30,
2012
 
June 30,
2011
 
June 30,
2012
 
June 30,
2011
 
(in thousands, except per share data)
Basic earnings per share:
 
 
 
 
 
 
 
Net income
$
6,164

 
$
68,214

 
$
1,580

 
$
128,447

Shares used in computation:
 
 
 
 
 
 
 
Weighted-average common shares outstanding
55,526

 
52,470

 
55,491

 
52,614

Basic earnings per share
$
0.11

 
$
1.30

 
$
0.03

 
$
2.44

 
 
 
 
 
 
 
 
Diluted earnings per share:
 
 
 
 
 
 
 
Net income
$
6,164

 
$
68,214

 
$
1,580

 
$
128,447

Convertible Notes interest expense, net of tax
48

 

 
98

 

Numerator for diluted earnings per share
$
6,212

 
$
68,214

 
$
1,678

 
$
128,447

Shares used in computation:
 
 
 
 
 
 
 
Weighted-average common shares outstanding
55,526

 
52,470

 
55,491

 
52,614

Convertible notes shares
2,331

 

 
2,331

 

Employee stock options
952

 
1,439

 
1,056

 
1,463

Weighted-average number of shares
58,809

 
53,909

 
58,878

 
54,077

Diluted earnings per share
$
0.11

 
$
1.26

 
$
0.03

 
$
2.37

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following table summarizes the potential common shares excluded from the diluted calculation:

 
Three Months Ended
 
Six Months Ended
 
June 30,
2012
 
June 30,
2011
 
June 30,
2012
 
June 30,
2011
 
(in thousands)
Employee stock options
1,184

 
12

 
908

 
19