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Inventories (Tables)
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Schedule of Inventory
Our significant components of inventory at March 31, 2022 and December 31, 2021 were as follows (in thousands):
March 31, 2022December 31, 2021
Raw materials and parts$103,917 $97,053 
Work in process30,045 24,618 
Finished goods189,523 182,954 
Gross inventories323,485 304,625 
Inventory reserve(59,706)(62,885)
Inventories$263,779 $241,740