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Quarterly Results of Operations (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Quarterly data for the years ended December 31, 2012 and 2011 consisted of the following (in thousands, except per share amounts):

 
Quarter Ended
 
March 31
 
June 30
 
September 30
 
December 31
2012
 

 
 

 
 

 
 

Net sales
$
95,618

 
$
100,532

 
$
95,907

 
$
102,231

Gross profit
44,170

 
47,024

 
45,335

 
45,463

Income from operations
8,007

 
8,222

 
9,082

 
4,330

Income tax expense
2,169

 
2,719

 
1,811

 
1,209

Net income
5,748

 
6,095

 
7,226

 
641

Basic earnings per common share
0.14

 
0.14

 
0.17

 
0.02

Diluted earnings per common share
0.14

 
0.14

 
0.17

 
0.01

 
 
 
 
 
 
 
 
2011
 

 
 

 
 

 
 

Net sales
$
86,631

 
$
91,249

 
$
90,477

 
$
91,092

Gross profit
39,785

 
42,484

 
41,054

 
42,145

Income from operations
10,210

 
10,847

 
6,507

 
5,626

Income tax expense
3,159

 
3,746

 
2,120

 
806

Net income
6,639

 
6,872

 
4,563

 
4,970

Basic earnings per common share
0.19

 
0.19

 
0.11

 
0.12

Diluted earnings per common share
0.18

 
0.18

 
0.11

 
0.12