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INVENTORIES
3 Months Ended
Mar. 31, 2015
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 March 31, 2015 and December 31, 2014 consisted of the following:
 
             
   
March 31,
2015
   
December 31,
2014
 
Chassis
  $ 7,790     $ 4,700  
Raw materials
    25,351       24,291  
Work in process
    10,400       10,477  
Finished goods
    18,232       16,992  
    $ 61,773     $ 56,460