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Earnings per share (Tables)
 6 Months Ended
May 31, 2018
Earnings Per Share [Abstract]  
Calculation of Basic and Diluted Earnings Per Share
The following table sets forth the calculation of basic and diluted earnings per share on an interim basis (in thousands, except per share data):

 
Three Months Ended
 
Six Months Ended
 
May 31,
2018
 
May 31,
2017
 
May 31,
2018
 
May 31,
2017
Net income
$
15,403

 
$
10,341

 
$
28,315

 
$
9,816

Weighted average shares outstanding
45,531

 
48,221

 
46,030

 
48,477

Dilutive impact from common stock equivalents
556

 
269

 
751

 
285

Diluted weighted average shares outstanding
46,087

 
48,490

 
46,781

 
48,762

Basic earnings per share
$
0.34

 
$
0.21

 
$
0.62

 
$
0.20

Diluted earnings per share
$
0.33

 
$
0.21

 
$
0.61

 
$
0.20