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Inventory
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventory

5. Inventory

(in thousands)

    

September 30, 2021

    

December 31, 2020

Parts and supplies

$

59,478

$

57,433

Work in progress

 

7,152

 

6,237

Inventory

$

66,630

$

63,670