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Inventory (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of inventory, net of reserves
Inventory consisted of the following amounts (in thousands):
 
September 30, 2018
 
December 31, 2017
Parts and supplies
$
65,393

 
$
72,528

Work in progress
12,104

 
18,163

Inventory
$
77,497

 
$
90,691