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Inventory (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of inventory, net of reserves

(in thousands)

    

June 30, 2021

    

December 31, 2020

Parts and supplies

$

58,331

$

57,433

Work in progress

 

7,554

 

6,237

Inventory

$

65,885

$

63,670