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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 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 per share data):

 
 
Year Ended December 31,
 
 
2013
 
2012
 
2011
Net income
 
$
97,330

 
$
81,972

 
$
71,993

Weighted average shares outstanding:
 
 
 
 

 
 

Basic
 
46,282

 
46,937

 
48,158

Effect of dilutive securities:
 
 
 
 

 
 

Stock options and employee stock purchase plan
 
1,248

 
1,121

 
829

Diluted
 
47,530

 
48,058

 
48,987

 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
Basic
 
$
2.10

 
$
1.75

 
$
1.49

Diluted
 
$
2.05

 
$
1.71

 
$
1.47

 
 
 
 
 
 
 
Anti-dilutive stock options excluded from diluted earnings per share computations (1)
 
—

 
417

 
1,381


(1) 
Since these options have exercise prices that are higher than the average market prices of our common stock, including them in the calculation would have an anti-dilutive effect on earnings per share.