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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the computation of the basic and diluted earnings per share for the three months ended March 31, 2018 and 2019 (in thousands, except per share data):
 
Three Months Ended March 31,
 
2018
 
2019
Numerator for basic and diluted earnings per share:
 
 
 
Net income
$
9,356

 
$
6,525

Less: Earnings allocated to unvested restricted stock
(60
)
 
(33
)
Income attributable to common stockholders
$
9,296

 
$
6,492

 
 
 
 
Denominator:
 
 
 
Denominator for basic earnings per common share - weighted average shares outstanding
16,094

 
18,057

Effect of dilutive securities:
 
 
 
Stock options
376

 
40

Convertible Notes
1,230

 
—

Denominator for diluted earnings per common share - weighted average shares outstanding
17,700

 
18,097

 
 
 
 
Basic earnings per common share:
$
0.58

 
$
0.36

Diluted earnings per common share:
$
0.52

 
$
0.36