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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Computation of earnings per share and reconciliation of basic and diluted weighted average common shares outstanding
The table below presents the computation of earnings per share, including the reconciliation of basic and diluted weighted average shares outstanding (in thousands, except EPS):

 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2013
 
2012
 
2013
 
2012
Net income
 
$
32,332

 
$
21,375

 
$
102,305

 
$
89,969

 
 
 
 
 
 
 
 
 
Weighted average shares outstanding:
 
 
 
 
 
 
 
 
Basic
 
46,380

 
46,574

 
46,475

 
47,076

Effect of dilutive securities:
 
 
 
 
 
 
 
 
Stock options and employee stock purchase plan
 
1,218

 
1,213

 
1,245

 
1,129

Diluted
 
47,598

 
47,787

 
47,720

 
48,205

 
 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
 
Basic
 
$
0.70

 
$
0.46

 
$
2.20

 
$
1.91

Diluted
 
$
0.68

 
$
0.45

 
$
2.14

 
$
1.87

 
 
 
 
 
 
 
 
 
Anti-dilutive stock options excluded from diluted earnings per share computations
 
—

 
4

 
—

 
964