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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
The following table shows the computation of basic and diluted earnings per share:
 
(Dollars and shares in thousands, except per share data)
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Net income
$
134,743

 
$
50,244

 
$
64,080

Denominator:
 
 
 
 
 
Weighted average shares
31,570

 
31,419

 
30,276

Dilutive potential common shares
597

 
884

 
810

Weighted average fully diluted shares
32,167

 
32,303

 
31,086

Earnings per share:
 
 
 
 
 
Basic
$
4.27

 
$
1.60

 
$
2.12

Diluted
$
4.19

 
$
1.56

 
$
2.06

Outstanding common stock equivalents having no dilutive effect
18

 
2

 
18