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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2013
Quarterly Financial Information (Unaudited) [Abstract]  
Unaudited quarterly financial information
 
 
 
Quarters Ended 2013
 
 
  
Q1
   
Q2
   
Q3
   
Q4
 
 
                
Net sales
 
$
399,572
  
$
346,688
  
$
363,269
  
$
376,236
 
Gross profit
  
153,462
   
130,953
   
139,463
   
145,682
 
Operating income
  
96,525
   
76,433
   
87,289
   
91,218
 
Net income
  
50,674
   
28,254
   
47,093
   
48,518
 
Net income per common share, basic:
 
$
0.75
  
$
0.41
  
$
0.69
  
$
0.71
 
Net income per common share, diluted:
 
$
0.73
  
$
0.40
  
$
0.67
  
$
0.69
 

 
 
Quarters Ended 2012
 
 
  
Q1
   
Q2
   
Q3
   
Q4
 
 
                
Net sales
 
$
294,561
  
$
239,137
  
$
300,586
  
$
342,022
 
Gross profit
  
111,005
   
87,429
   
115,813
   
126,153
 
Operating income
  
59,493
   
37,158
   
59,124
   
67,780
 
Net income
  
30,060
   
9,335
   
25,541
   
28,287
 
        Net income per common share, basic:
 
$
0.45
  
$
0.14
  
$
0.38
  
$
0.42
 
        Net income per common share, diluted:
 
$
0.44
  
$
0.14
  
$
0.37
  
$
0.41