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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Computation of basic and diluted earnings per share
The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share amounts):
 
 
Three Months Ended
 
 
March 31,
 
 
2018
 
2017
Numerator:
 
 
 
 
Net income
 
$
41,635

 
$
32,645

 
 
 
 
 
Denominator (in thousands):
 
 
 
 
Weighted-average common shares for calculating basic earnings per share
 
46,426

 
48,389

Effect of dilutive securities:
 
 
 
 
Stock options and nonvested common stock awards
 
53

 
13

Weighted-average common shares for calculating diluted earnings per share
 
46,479

 
48,402

 
 
 
 
 
Net income per share:
 
 
 
 
Basic
 
$
0.90

 
$
0.67

Diluted
 
$
0.90

 
$
0.67