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Earnings Per Share Earnings Per Share (Tables)
 12 Months Ended
Dec. 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 years ended December 31, 2016, 2017 and 2018 (in thousands, except per share data): 
 
Year Ended December 31,
 
2016
 
2017
 
2018
Numerator for basic and diluted earnings per share:
 
 
 
 
 
Net income
$
19,581

 
$
37,193

 
$
11,645

Less: Earnings allocated to unvested restricted stock
(89
)
 
(135
)
 
(57
)
Income attributable to common stockholders
$
19,492

 
$
37,058

 
$
11,588

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Denominator for basic earnings per common share - weighted average shares outstanding
16,515

 
16,438

 
17,971

Effect of dilutive securities:
 
 
 
 
 
Stock options
454

 
336

 
66

Convertible subordinated notes
491

 
941

 
337

Denominator for diluted earnings per common share - weighted average shares outstanding
17,460

 
17,715

 
18,374

 
 
 
 
 
 
Basic earnings per common share
$
1.18

 
$
2.25

 
$
0.64

Diluted earnings per common share
$
1.12

 
$
2.09

 
$
0.63