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INVENTORIES (Tables)
 3 Months Ended
Mar. 31, 2017
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 market. The cost of manufactured inventory includes raw materials, labor and overhead. Inventories consist of the following (in thousands):
 
 
 
March 31,
 
December 31,
 
 
 
2017
 
2016
 
Finished goods
 
$
97,486
 
$
57,297
 
Raw materials and components
 
 
60,269
 
 
53,388
 
Work in progress
 
 
20,929
 
 
18,422
 
Aftermarket parts
 
 
7,898
 
 
8,356
 
Used trailers
 
 
3,638
 
 
2,490
 
 
 
$
190,220
 
$
139,953