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Inventories (Tables)
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory Our significant components of inventory at March 31, 2021 and December 31, 2020 were as follows (in thousands):
March 31, 2021December 31, 2020
Raw materials and parts$124,343 $151,531 
Work in process18,959 15,946 
Finished goods202,589 229,212 
Gross inventories345,891 396,689 
Inventory reserve(109,464)(144,942)
Inventories$236,427 $251,747