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Quarterly Results of Operations (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Quarterly financial information
 
As adjusted for impact of the change to FIFO
(Dollars in thousands, except per share amounts)
2015
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Net sales
$
165,051

 
$
163,098

 
$
160,366

 
$
152,928

Gross margin
$
62,425

 
$
60,661

 
$
59,672

 
$
52,604

Net income
$
13,643

 
$
13,554

 
$
12,546

 
$
6,577

 

 
 
 
 
 
 
Net income per share:

 
 
 
 
 
 
   Basic
$
0.74

 
$
0.73

 
$
0.68

 
$
0.37

   Diluted
$
0.72

 
$
0.71

 
$
0.67

 
$
0.37

 
 
 
 
 
 
 
 
 
2014
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Net sales
$
146,640

 
$
153,495

 
$
163,052

 
$
147,724

Gross margin
$
54,107

 
$
57,376

 
$
64,576

 
$
58,695

Net income
$
14,702

 
$
11,056

 
$
20,407

 
$
7,247

 
 
 
 
 
 
 
 
Net income per share:
 
 
 
 
 
 
 
   Basic
$
0.82

 
$
0.61

 
$
1.12

 
$
0.40

   Diluted
$
0.79

 
$
0.59

 
$
1.09

 
$
0.39





 
As originally reported
(Dollars in thousands, except per share amounts)
2015
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
Net sales
$
165,051

 
$
163,098

 
$
160,366

 
$
152,928

Gross margin
$
62,355

 
$
60,589

 
$
59,530

 
$
52,604

Net income
$
13,627

 
$
13,540

 
$
12,455

 
$
6,577

 
 
 
 
 
 
 
 
Net income per share:
 
 
 
 
 
 
 
   Basic
$
0.74

 
$
0.73

 
$
0.68

 
$
0.37

   Diluted
$
0.72

 
$
0.71

 
$
0.67

 
$
0.37

 
 
 
 
 
 
 
 
 
2014
 
First Quarter
 
Second Quarter
 
Third Quarter
 
Fourth Quarter
Net sales
$
146,640

 
$
153,495

 
$
163,052

 
$
147,724

Gross margin
$
53,919

 
$
57,138

 
$
64,548

 
$
58,335

Net income
$
14,580

 
$
10,902

 
$
20,388

 
$
7,013

 
 
 
 
 
 
 
 
Net income per share:
 
 
 
 
 
 
 
   Basic
$
0.81

 
$
0.60

 
$
1.12

 
$
0.38

   Diluted
$
0.79

 
$
0.58

 
$
1.09

 
$
0.37