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Inventory (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of inventory, net of reserves
Inventory consisted of the following (in thousands):
 
December 31,
 
2019
 
2018
Parts and supplies
$
66,121

 
$
65,645

Work in progress
8,346

 
10,688

Inventory
$
74,467

 
$
76,333