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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Inventory Disclosure [Abstract]    
Raw materials and parts $ 103,917 $ 97,053
Work in process 30,045 24,618
Finished goods 189,523 182,954
Gross inventories 323,485 304,625
Inventory reserve (59,706) (62,885)
Inventories $ 263,779 $ 241,740