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Earnings Per Share Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2015, 2016 and 2017 (in thousands, except per share data): 
 
Year Ended December 31,
 
2015
 
2016
 
2017
Numerator for basic and diluted earnings per share:
 
 
 
 
 
Net income
$
20,853

 
$
19,581

 
$
37,193

Less: Earnings allocated to unvested restricted stock
(257
)
 
(89
)
 
(135
)
Income attributable to common stockholders
$
20,596

 
$
19,492

 
$
37,058

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Denominator for basic earnings per common share - weighted average shares outstanding
17,791

 
16,515

 
16,438

Effect of dilutive securities:
 
 
 
 
 
Stock options
246

 
454

 
336

Convertible subordinated notes
276

 
491

 
941

Denominator for diluted earnings per common share - weighted average shares outstanding
18,313

 
17,460

 
17,715

 
 
 
 
 
 
Basic earnings per common share
$
1.16

 
$
1.18

 
$
2.25

Diluted earnings per common share
$
1.12

 
$
1.12

 
$
2.09