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INVENTORIES
 6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
INVENTORIES INVENTORIES
Inventories consist of the following components (in thousands):
 
June 30,
2019
 
December 31,
2018
Raw materials and components
$
139,236

 
$
115,083

Finished goods
99,351

 
48,698

Work in progress
18,095

 
13,119

Aftermarket parts
7,307

 
6,421

Used trailers
578

 
1,083

 
$
264,567

 
$
184,404