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Inventories
6 Months Ended
Jun. 30, 2012
Inventories [Abstract]  
Inventories
 
Inventories are valued at the lower of cost or market. Inventories at June 30, 2012 and December 31, 2011 consisted of the following:
 
   
June 30,
  
December 31,
 
   
2012
  
2011
 
Inventories carried at LIFO:
      
Finished goods
 $36,100  $32,648 
Raw materials, production parts and work-in-process
  16,987   16,611 
LIFO reserve
  (27,926)  (27,926)
Total LIFO inventories
  25,161   21,333 
          
Inventories carried at FIFO:
        
Finished goods
  28,980   31,912 
Raw materials, production parts and work-in-process
  14,272   12,667 
Total FIFO inventories
  43,252   44,579 
Total inventories
 $68,413  $65,912 
 
The LIFO reserve approximates the difference between LIFO carrying cost and FIFO.