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Quarterly Results of Operations (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly financial information
(Dollars in thousands, except per share amounts)
2017
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Net sales
$
203,828

 
$
201,424

 
$
206,783

 
$
209,008

Gross margin
$
80,350

 
$
80,546

 
$
82,188

 
$
75,491

Net income
$
27,032

 
$
20,896

 
$
25,532

 
$
6,999

Net income per share:
 
 
 
 
 
 
 
Basic
$
1.50

 
$
1.15

 
$
1.40

 
$
0.38

Diluted
$
1.47

 
$
1.13

 
$
1.37

 
$
0.37