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INVENTORIES
6 Months Ended
Jun. 30, 2014
Inventory Disclosure [Abstract]  
INVENTORIES
3.
INVENTORIES
 
Inventory costs include materials, labor and factory overhead. Inventories are stated at the lower of cost or market, 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, 2014 and December 31, 2013 consisted of the following:
 
             
   
June 30,
2014
   
December 31,
2013
 
Chassis
  $ 5,694     $ 7,665  
Raw materials
    25,339       25,772  
Work in process
    10,525       9,915  
Finished goods
    13,619       10,820  
    $ 55,177     $ 54,172