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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 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
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
 
Net income
 
$
30,171

 
$
15,239

 
$
71,806

 
$
47,884

 
 
 
 
 
 
 
 
 
Denominator (in thousands):
 
 
 
 
 
 
 
 
Weighted-average common shares for calculating basic earnings per share
 
44,942

 
48,261

 
45,680

 
48,324

Effect of dilutive securities:
 
 
 
 
 
 
 
 
Stock options and nonvested common stock awards
 
101

 
28

 
77

 
21

Weighted-average common shares for calculating diluted earnings per share
 
45,043

 
48,289

 
45,757

 
48,345

 
 
 
 
 
 
 
 
 
Net income per share:
 
 
 
 
 
 
 
 
Basic
 
$
0.67

 
$
0.32

 
$
1.57

 
$
0.99

Diluted
 
$
0.67

 
$
0.32

 
$
1.57

 
$
0.99