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INVENTORIES (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories are stated at the lower of cost, determined either on the first-in, first-out or average cost method, or net realizable value. The cost of manufactured inventory includes raw material, labor and overhead. Inventories, net of reserves, consist of the following (in thousands):
  
  
September 30,
  
December 31,
 
  
2018
  
2017
 
Raw materials and components $104,797  $83,834 
Finished goods  101,490   54,000 
Work in progress  18,281   29,123 
Aftermarket parts  6,468   6,448 
Used trailers  1,414   7,330 
  $232,450  $180,735