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Inventories
9 Months Ended
Sep. 30, 2011
Inventories [Abstract] 
Inventories
5. Inventories
 
Inventories are valued at the lower of cost or market. Inventories at September 30, 2011 and December 31, 2010 consisted of the following:
 
   
September 30,
  
December 31,
 
   
2011
  
2010
 
Inventories carried at LIFO:
      
Finished goods
 $38,067  $31,355 
Raw materials, production parts and work-in-process
  19,728   15,414 
LIFO reserve
  (26,462)  (26,462)
Total LIFO inventories
  31,333   20,307 
          
Inventories carried at FIFO:
        
Finished goods
  32,573   23,770 
Raw materials, production parts and work-in-process
  13,502   17,669 
Total FIFO inventories
  46,075   41,439 
Total inventories
 $77,408  $61,746 

The LIFO reserve approximates the difference between LIFO carrying cost and FIFO.