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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
 
2012
 
2011
 
First
Second
Third
Fourth
 
First
Second
Third
Fourth
Sales
$
155,911

$
167,009

$
156,078

$
149,404

 
$
140,715

$
160,824

$
155,057

$
146,997

Gross profit
35,238

39,161

37,070

32,043

 
31,901

37,391

37,223

28,570

Net income
6,785

9,344

8,575

4,199

 
5,667

8,914

10,056

8,050

Earnings per share
 

 

 

 

 
 

 

 

 

Diluted
$
0.56

$
0.77

$
0.71

$
0.35

 
$
0.47

$
0.74

$
0.84

$
0.67

Average shares
 

 

 

 

 
 

 

 

 

Diluted
12,027

12,058

12,056

12,090

 
11,980

11,966

11,947

11,973

Dividends per share
$
0.06

0.06

$
0.06

$
0.06

 
$
0.06

$
0.06

$
0.06

$
0.06

Market price of
    common stock
 

 

 

 

 
 

 

 

 

High
$
30.93

$
34.23

$
34.00

$
34.63

 
$
29.27

$
28.87

$
25.05

$
29.20

Low
$
25.51

$
29.40

$
27.07

$
29.66

 
$
25.32

$
21.09

$
20.35

$
19.71