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Inventory, net (Tables)
9 Months Ended
Sep. 30, 2015
Inventory Disclosure [Abstract]  
Schedule of inventory, net of reserves
Inventory, net of reserves, consisted of the following amounts (in thousands):
 
 
September 30, 2015
 
December 31, 2014
Parts and supplies
$
255,008

 
$
269,370

Work in progress
77,933

 
100,499

Finished goods
46,657

 
33,702

Inventory, net
$
379,598

 
$
403,571