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Inventory (Tables)
12 Months Ended
Dec. 31, 2015
Inventory Disclosure [Abstract]  
Schedule of inventory, net of reserves
Inventory consisted of the following amounts (in thousands):

 
December 31,
 
2015
 
2014
Parts and supplies
$
109,634

 
$
120,646

Work in progress
19,777

 
25,140

Inventory
$
129,411

 
$
145,786