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Inventory (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory, net of reserves

Inventory consisted of the following (in thousands):

    

September 30, 2020

    

December 31, 2019

Parts and supplies

$

58,906

$

66,121

Work in progress

 

6,405

 

8,346

Inventory

$

65,311

$

74,467