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Inventory (Tables)
3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of inventory, net of reserves
Inventory consisted of the following amounts (in thousands):
 
 
March 31, 2017
 
December 31, 2016
Parts and supplies
$
82,307

 
$
80,641

Work in progress
12,753

 
13,160

Inventory
$
95,060

 
$
93,801