QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Tables)
 12 Months Ended
Dec. 29, 2013
QUARTERLY FINANCIAL INFORMATION (UNAUDITED) [Abstract]  
Quarterly Financial Information
 
2013
 
 
 
First
  
Second
  
Third
  
Fourth
  
Total
 
Revenue
 
$
93,204
  
$
99,778
  
$
96,919
  
$
107,366
  
$
397,267
 
Gross profit
  
40,801
   
45,411
   
40,277
   
51,541
   
178,030
 
Net earnings
  
3,793
   
6,602
   
4,546
   
11,260
   
26,201
 
Earnings per share
                    
Basic - class A and B common stock
  
0.08
   
0.13
   
0.09
   
0.22
   
0.52
 
Diluted - class A and B common stock
  
0.08
   
0.13
   
0.09
   
0.22
   
0.52
 
           
2012
         
 
 
First
  
Second
  
Third
  
Fourth
  
Total
 
Revenue
 
$
80,673
  
$
94,068
  
$
96,219
  
$
122,158
  
$
393,118
 
Gross profit
  
33,013
   
45,573
   
43,906
   
65,377
   
187,869
 
Net earnings
  
2,919
   
7,611
   
7,698
   
15,097
   
33,325
 
Earnings per share
                    
Basic - class A and B common stock
  
0.05
   
0.13
   
0.14
   
0.30
   
0.61
 
Diluted - class A and B common stock
  
0.05
   
0.13
   
0.14
   
0.30
   
0.61
 
Basic and diluted - class C common stock
  
0.19
   
0.28
   
0.15
   
-
   
0.74