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Quarterly Data (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Summary of selected quarterly financial data
The following tables summarize selected quarterly financial data for the years ended December 31, 2012 and 2011:
 
 
2012
(Dollars in thousands except per share amounts)
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
Net sales
 
$
353,630

 
$
325,088

 
$
290,601

 
$
303,759

 
$
1,273,078

Gross margin
 
49,418

 
53,024

 
52,369

 
43,972

 
198,783

Percent of sales
 
14.0
%
 
16.3
%
 
18.0
%
 
14.5
%
 
15.6
%
Net income
 
$
6,118

 
$
7,929

 
$
8,114

 
$
2,503

 
$
24,664

Net income per share of common stock:
 
 
 
 
 
 
 
 
 
 
Basic
 
0.30

 
0.39

 
0.40

 
0.12

 
1.21

Diluted
 
0.30

 
0.38

 
0.39

 
0.12

 
1.19

Dividends per share of common stock
 

 
0.075

 
0.075

 
0.075

 
0.225

Stock price range:
 
 
 
 
 
 
 
 
 
 
High
 
32.91

 
29.37

 
25.57

 
25.93

 
 
Low
 
24.77

 
20.37

 
17.59

 
18.84

 
 
  
 
2011
  
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Total
Net sales
 
$
374,805

 
$
424,710

 
$
392,794

 
$
334,421

 
$
1,526,730

Gross margin
 
55,800

 
62,671

 
57,350

 
39,500

 
215,321

Percent of sales
 
14.9
%
 
14.8
%
 
14.6
%
 
11.8
%
 
14.1
%
Net income
 
$
11,818

 
$
13,872

 
$
13,527

 
$
762

 
$
39,979

Net income per share of common stock:
 
 
 
 
 
 
 
 
 
 
Basic
 
0.58

 
0.68

 
0.66

 
0.04

 
1.96

Diluted
 
0.57

 
0.67

 
0.65

 
0.04

 
1.93

Stock price range:
 
 
 
 
 
 
 
 
 
 
High
 
44.94

 
44.00

 
42.05

 
30.15

 
 
Low
 
33.99

 
33.02

 
21.11

 
19.53