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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2016
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 (unaudited, in thousands, except per share data):
 
 
Three Months Ended
 
 
March 31,
 
 
2016
 
2015
Numerator:
 
 
 
 
Net income
 
$
13,174

 
$
16,788

 
 
 
 
 
Denominator:
 
 
 
 
Weighted-average common shares for calculating basic earnings per share
 
28,241

 
28,402

Effect of dilutive securities:
 
 
 
 
Stock options and nonvested awards
 
—

 
218

Weighted-average common shares for calculating diluted earnings per share
 
28,241

 
28,620

 
 
 
 
 
Net income per share:
 
 
 
 
Basic
 
$
0.47

 
$
0.59

Diluted
 
$
0.47

 
$
0.59