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Inventories (Tables)
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Summary of components of inventories
Components of inventories are as follows (in thousands):
March 31,
2022
December 31,
2021
Serialized parts$47,629 $44,642 
Non-serialized parts42,170 41,174 
Total inventories$89,799 $85,816