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Industry Segments (Tables)
 3 Months Ended
Mar. 31, 2013
Industry Segments [Abstract]  
Sales and operating income by operating segments
The following tables show our net sales and operating income by our operating segments (in thousands):

Three Months Ended
March 31,
2013
2012
Net Sales
   Engine Management                                                                            
$
175,509
$
163,015
   Temperature Control                                                                            
52,728
45,291
   All Other                                                                            
2,471
3,405
         Consolidated                                                                            
$
230,708
$
211,711
Intersegment Revenue
   Engine Management                                                                            
$
5,453
$
4,488
   Temperature Control                                                                            
1,509
1,109
   All Other                                                                            
(6,962
)
(5,597
)
         Consolidated                                                                            
$
—
$
—
 
Operating Profit
 
 
 
 
 
 
   Engine Management                                                                            
 
$
20,784
 
 
$
13,688
 
   Temperature Control                                                                            
 
 
(454
)
 
 
48
 
   All Other                                                                            
 
 
(4,300
)
 
 
(4,033
)
         Consolidated                                                                            
 
$
16,030
 
 
$
9,703