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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories consist of the following (in thousands):
 
September 30,
 
December 31,
 
2019
 
2018
Raw material and subassemblies
$
226,695

 
$
214,164

Work-in-progress
46,423

 
43,096

Finished goods
124,429

 
94,847

 
$
397,547

 
$
352,107