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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2015
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):
 
 
 
March 31,
 
December 31,
 
 
 
2015
 
2014
 
Raw materials and components
 
$
76,584
 
$
63,847
 
Work in progress
 
 
24,730
 
 
23,145
 
Finished goods
 
 
111,776
 
 
68,923
 
Aftermarket parts
 
 
8,911
 
 
8,446
 
Used trailers
 
 
21,001
 
 
12,783
 
 
 
$
243,002
 
$
177,144