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

Inventory consisted of the following (in thousands):

    

June 30, 2020

    

December 31, 2019

Parts and supplies

$

64,774

$

66,121

Work in progress

 

6,217

 

8,346

Inventory

$

70,991

$

74,467