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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
The following table sets forth the computation of basic and diluted earnings per share:
  
Years ended December 31,
 
(dollars in thousands, except per share amounts)
2017

2016

2015

Numerator:
 
 
 
Net income
$
65,933

$
41,515

$
25,649

Denominator:
 
 
 
Weighted average common shares
46,669,440

46,132,389

45,623,854

Add effect of dilutive securities:
 
 
 
Stock-based awards
1,106,262

1,184,149

874,850

Weighted average common shares assuming dilution
47,775,702

47,316,538

46,498,704

Earnings per share:
 
 
 
Basic
$
1.41

$
0.90

$
0.56

Diluted
$
1.38

$
0.88

$
0.55

 
 
 
 
Anti-dilutive shares excluded from calculations of diluted earnings per share
4,634

7,339

18,554