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INVENTORIES (Tables)
 6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories are stated at the lower of cost, primarily determined on the first-in, first-out (FIFO) method, or market. The cost of manufactured inventory includes raw material, labor and overhead. Inventories consist of the following (in thousands):
 
 
 
June 30,
 
December 31,
 
 
 
2016
 
2015
 
Finished goods
 
$
115,462
 
$
67,260
 
Used trailers
 
 
5,894
 
 
7,017
 
Raw materials and components
 
 
58,809
 
 
65,790
 
Aftermarket parts
 
 
9,187
 
 
8,714
 
Work in progress
 
 
23,664
 
 
18,201
 
 
 
$
213,016
 
$
166,982