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Inventories
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
Our significant components of inventory at September 30, 2020 and December 31, 2019 were as follows (in thousands):
September 30, 2020December 31, 2019
Raw materials and parts$166,817 $172,082 
Work in process15,838 29,972 
Finished goods252,346 278,661 
Gross inventories435,001 480,715 
Inventory reserve(70,346)(66,075)
Inventories$364,655 $414,640