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Inventory
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventory
5. Inventory
 
Inventory consisted of the following amounts (in thousands):
 
March 31, 2018
 
December 31, 2017
Parts and supplies
$
70,401

 
$
72,528

Work in progress
13,807

 
18,163

Inventory
$
84,208

 
$
90,691