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Earnings Per Share (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2017 and 2018 (in thousands, except per share data):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2018
 
2017
 
2018
Numerator for basic and diluted earnings per share:
 
 
 
 
 
 
 
Net income
$
3,038

 
$
2,200

 
$
14,532

 
$
14,303

Less: Earnings allocated to unvested restricted stock
(10
)
 
(11
)
 
(52
)
 
(79
)
Income attributable to common stockholders
$
3,028

 
$
2,189

 
$
14,480

 
$
14,224

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Denominator for basic earnings per common share - weighted average shares outstanding
16,476

 
19,060

 
16,575

 
17,701

Effect of dilutive securities:
 
 
 
 
 
 
 
Stock options
335

 
101

 
332

 
123

Convertible Notes
787

 
—

 
980

 
449

Denominator for diluted earnings per common share - weighted average shares outstanding
17,598

 
19,161

 
17,887

 
18,273

 
 
 
 
 
 
 
 
Basic earnings per common share:
$
0.18

 
$
0.11

 
$
0.87

 
$
0.80

Diluted earnings per common share:
$
0.17

 
$
0.11

 
$
0.81

 
$
0.78