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Inventories
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consist of the following (in thousands):
 March 31,December 31,
 20212020
Raw material and subassemblies$268,409 $281,641 
Work-in-progress56,930 51,763 
Finished goods131,668 138,833 
$457,007 $472,237