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Earnings per Share
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Earnings per Share
Earnings per Share

The following table sets forth the calculations of basic and diluted earnings per share (in thousands, except per share data):

 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2015
 
2014
 
2015
 
2014
Numerator:
 

 
 

 
 

 
 

Net income used for calculating basic and diluted earnings per common share
$
51,155

 
$
53,040

 
$
79,506

 
$
90,776

 
 
 
 
 
 
 
 
Denominator:
 

 
 

 
 

 
 

Weighted average number of common shares used in the calculation of basic earnings per share
83,203

 
89,521

 
84,871

 
90,595

Common stock equivalents associated with stock-based compensation plans (1)
1,068

 
1,223

 
1,193

 
1,417

Shares used in the calculation of diluted earnings per share
84,271

 
90,744

 
86,064

 
92,012

 
 
 
 
 
 
 
 
Basic earnings per share
$
0.61

 
$
0.59

 
$
0.94

 
$
1.00

Diluted earnings per share
$
0.61

 
$
0.58

 
$
0.92

 
$
0.99

 
(1)
Certain common stock equivalents were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive. These common share equivalents totaled less than 0.3 million in each of the periods presented.