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INVENTORIES
6 Months Ended
Jun. 30, 2013
Inventory Disclosure [Abstract]  
INVENTORIES
3.
INVENTORIES
 
Inventory costs include materials, labor and factory overhead. Inventories are stated at the lower of cost or market (net realizable value), determined on a first-in, first-out basis. Appropriate consideration is given to obsolescence, valuation and other factors in determining net realizable value. Revisions of these estimates could result in the need for adjustments. Inventories, net of reserves, at June 30, 2013 and December 31, 2012 consisted of the following:
 
             
   
June 30,
2013
   
December 31,
2012
 
Chassis
  $ 8,944     $ 9,952  
Raw materials
    23,740       18,856  
Work in process
    9,794       7,961  
Finished goods
    8,930       8,276  
    $ 51,408     $ 45,045