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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
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 and six months ended June 30, 2017 and 2018 (in thousands, except per share data):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2018
 
2017
 
2018
Numerator for basic and diluted earnings per share:
 
 
 
 
 
 
 
Net income
$
4,410

 
$
2,747

 
$
11,494

 
$
12,103

Less: Earnings allocated to unvested restricted stock
(15
)
 
(14
)
 
(43
)
 
(67
)
Income attributable to common stockholders
$
4,395

 
$
2,733

 
$
11,451

 
$
12,036

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings per common share - weighted average shares outstanding
16,652

 
17,916

 
16,625

 
17,010

Effect of dilutive securities:
 
 
 
 
 
 
 
Stock options
377

 
212

 
381

 
240

Convertible Notes
1,064

 
117

 
1,077

 
674

Denominator for diluted earnings per common share - weighted average shares outstanding
18,093

 
18,245

 
18,083

 
17,924

 
 
 
 
 
 
 
 
Basic earnings per common share:
$
0.26

 
$
0.15

 
$
0.69

 
$
0.71

Diluted earnings per common share:
$
0.24

 
$
0.15

 
$
0.63

 
$
0.67