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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2017 and 2018 (in thousands, except per share data):
 
Three Months Ended March 31,
 
2017
 
2018
Numerator for basic and diluted earnings per share:
 
 
 
Net income
$
7,084

 
$
9,356

Less: Earnings allocated to unvested restricted stock
(27
)
 
(60
)
Income attributable to common stockholders
$
7,057

 
$
9,296

 
 
 
 
Denominator:
 
 
 
Denominator for basic earnings per common share - weighted average shares outstanding
16,597

 
16,094

Effect of dilutive securities:
 
 
 
Stock options
395

 
376

Convertible subordinated notes
1,090

 
1,230

Denominator for diluted earnings per common share - weighted average shares outstanding
18,082

 
17,700

 
 
 
 
Basic earnings per common share:
$
0.42

 
$
0.58

Diluted earnings per common share:
$
0.39

 
$
0.52