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Inventory (Tables)
6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of inventory, net of reserves
Inventory consisted of the following amounts (in thousands):
 
 
June 30, 2016
 
December 31, 2015
Parts and supplies
$
102,471

 
$
109,634

Work in progress
13,976

 
19,777

Inventory
$
116,447

 
$
129,411